It's all I can think about. That evening, after Eomma returns from seeing Halmeoni in Gwangju and lets me borrow her car, I'm sitting inside the Daegu Observatory's dark auditorium for my monthly astronomy club meeting. Sometimes we head up to the roof with our telescopes, but this moth, it's an info-only gathering. And thanks to that Bahamas photo book, I'm paying zero attention to Dr. Choi, the retired teacher who's president of our local chapter. He's addressing the group - a couple dozen people, mostly other retirees and a handful of students my age - while standing at a podium near the controls that turn the ceiling into a light show of the night sky. I lost what he was saying a quarter of an hour back, something about where we were going to be watching the Perseid meteor shower.

Instead, my mind is stuck on that photo of my dad kissing that woman.

He lied to eomma. He lied to me.

And he forced me to lie, telling eomma that the Jeons hadn't received any of our mail, because no way was I handing over that ticking-bomb package of agony over to eomma. Not right now, when she's full of cheer and sunshine, encouraging me to on the camping trip with Seolhyun. Maybe not ever. I don't know. This will tear our family apart.

I've never been in this kind of position, being forced to decide where I should hide photos of my dad two-timing eomma. Or three-timing. Four-timing? What did that woman mean by "one of many"? The photos are from last summer, and I doubt this woman would want to call him out to his wife if she were still seeing him. So when did the affair end, and how many others were there? Are there?

Does he just pick up random acupuncturists from alternative health conventions?

Are they all local or overseas?

Do I know any of them?

Ugh. Considering all the possibilities hurts my brain. And what's even weirder about the whole thing is that the strange woman in the photos looks a lot like my birth mother. I mean, clearly it's not her, and this stranger is younger than my mother was when she died, but there's an uncanny resemblance. And that just freaks me out.

My dad is having an affair with someone who looks like his dead first wife. That's not normal.

What am I saying? None of this normal, no matter what she looks like. I think of Eomma smiling this morning, completely oblivious to the fact Dad's cheated on her, and it makes my stomach hurt all over again.

Thank God the normal clinic receptionist came in to take over for me at lunch, because no way could I handle looking my dad in the eye.

My stomach is sick. My heart is sick. Everything about this is wrong, wrong, wrong.

And the cherry on top of this sundae is that the Jeons know. Namjoon and Seokjin saw what was inside the envelope. They had to. I mean, judging from the awkward way they acted, and all that business about meeting for coffee if we ever needed to talk? It's hard for me to blame them for looking at the photobook. If they really did open it by accident, I'm sure the curiosity got the better of them. It did for me.

Huge mistake.

Oh, man. Does Jungkook know too?

"What's wrong?"

I snap out of my thoughts and realize the meeting has ended. The person speaking to me is a long dark hair girl sitting at my side. I've known Ahn Solbin as long as Jungkook and Seolhyun, when we first bonded over astronomy in the 7th-grade science class, both acing a quiz about planets. Solbin and I used to carpool to Seolhyun's house for sleepovers, staying up late to listen to music and gossip while her parents were asleep. But when I followed Seolhyun to the elite courtyard at school, Solbin stayed behind, secure with her social status. I always envied her confidence. Now the only time I really talk with Solbin is during astronomy club.

"Nothing's wrong," I tell her. No way am I bringing up the humiliation that is my father's affair. "I'm just thinking about something."

"Yeah, sort of figured," she says with a brief smile, crossing her arms over a black long-sleeve stop. "You've been 'thinking' all the way through Choi's meteor shower plans."

Most of the club members are filing out of the auditorium now, but a few hover around Dr. Choi's podium. Solbin is waiting for me to explain my mood, so I say the first thing that comes to mind to placate her curiosity.

"I've been invited to go on a camping trip with Seolhyun," I tell her.

To my surprise, she brightens. "Oooh, I heard about that."

Wait, she knew, but I didn't? And since when had she started talking to Seolhyun again?

"I overheard Park Bogum talking about it," she explains excitedly, twisting sideways to face me in the auditorium chairs while she sits cross-legged. "He was at the convenience store with his older sister earlier today."

"What?" Now I'm interested. Very interested.

She nods quickly. "I was behind him in the checkout line. He was talking to someone on his phone, saying that he was going camping near Queen's Forest with some other people from school. I didn't catch any names but Seolhyun's. He was trying to convince  whoever he was talking on the phone to go with him."

Park Bogum is a minor celebrity in our school. His parents don't have a ton of money, but somehow he's always doing things like skydiving, or going backstage at cool concerts, or jumping off the roof of some rich friend's house into their million-dollar pool. But he's not just a party-boy daredevil. He reads books . . . all kinds. Most guys I know don't even know what a bookstore is.

So yes, he's popular and pretty, but he's more than that. And I've been nursing a crush on him since elementary school. A crush that turned into a small obsession ever since he kissed me at a party over spring break. Sure, he got back with his on-again, off-again girlfriend the next day, which was humiliating and upsetting for me at the time. Seolhyun tried to cheer me up by playing matchmaker, introducing me to a couple of boys. Guess it wasn't meant to be for any of us, because I never clicked with those boys, and then Bogum and girlfriend broke up over the summer.

The important thing here is that if what Solbin overheard is true, it sounds like Bogum could be on Seolhyun's camping trip. And that makes the greta outdoors a lot more enticing.

More panic-inducing too, because Bogum was not a factor in my mental plan for this trip. Soelhyun's mom had said it would be all girls. No way would my parents let me go on a weeklong unsupervised camping trip with boys. My dad would flip the hell out.

Guess this information is under the table.

"Are you sure Bogum said he was actually going?" I ask Solbin.

"Yep." She hikes up her shoulders to make herself more musclular and pretends to be Bogum. "Bruh, you have to go with me. I need to jump off that wicked waterfall. We can Intagram the whole thing."

I snort at her bad impression.

She shrugs. "I'm just telling you what I heard."

"Who was he talking on the phone?" I ask.

"No idea. Probably his latest bromance. He's always changing friends, usually to whoever's parents are out of town and have a house big enough for one of his legendary blowouts."

"That's just an act," I argue. "He's not really that way."

her face softens. "I'm sorry. I know you like him, especially after that party . . ."

I wish I'd never told her about the kiss. It feels like a weakness.

"Anyway, I guess he's been expanding his friend list this summer. ZN even said she thought she saw him in the passenger seat of Jungkook's car a couple of weeks ago."

Wait, what? Jungkook and Bogum, friends? Surely that's a sign of the apocalypse. "I seriously doubt it."

"Maybe not. Jungkook seems way out of Bogum's league, if you ask me."

"I think you have that turned around," I say with a snort.

"And I think whatever happened between you and Jungkook is -"

"Solbin." I protest. I don't like to talk about Jungkook. Solbin doesn't even know about the Great Experiement. All Solbin knows is that we were supposed to meet with her for homecoming. She  doesn't know why that never happened. No one does. Not even me, really. But I stopped trying to figure out Jungkook's motivations a long time ago.

it's easier not to think about him at all.

"Never mind," she says. "I'm sorry I brought it up. It's none of my business."

After I'm quiet for a few seconds, she elbows me. "So . . . camping. Alone in the woods. Maybe it's your chance with Bogum. When is this trip?"

I texted Seolhyun earlier, but she only confirmed that the trip was happening and said she'd get back to me later with details. Normally, that would drive me crazy, but I was busy freaking out about hiding the photo book of my dad's affair. Now I wish I had pressed Seolhyun for more information. All of these Unknowns and Possibilities are stressing me out.

"I think it's in a couple of days?" I say. "Pretty sure she's planning on staying a week."

Seolhyun's face falls. "That's during the meteor shower. I was kind of hoping you were going on the weekend trip with the group."

"What group?"

"Our group. Daegu Planetary Society," she says, brows wrinkling. "Weren't you listening at all?"

I wasn't.

She fills me in. "Instead of gathering here at the observatory, Dr. Choi is taking the club on a road trip to the dark-sky area on Apsan Park to watch the meteor shower there."

Apsan National Park. They host the annual South Korea Star Party.

"All the other astronomy clubs in the area will be going," Solbin adds.

Apart from The Valley, Apsan Park is the closest dark-sky preserve. That means it's protected from artificial light pollution, which enables people to see more stars. Astronomers take amazing photos in dark-sky areas, especially during star parties - which are basically nighttime gatherings of amateur astronomers to watch celestial events. And though we've hosted a few minor star parties here at the observatory, I've never been to one this big with other astronomy clubs. That's kind of huge.

I weigh my options. On one hand, the geek in me really wants to attend this star party. I mean, hello. The Perseif meteor shower happens only once a year. But on the other hand, Park Bogum.

Rolling a two-wheeled laptop case behind him, Dr. Choi ascends the aisle and stops when he sees us. "Ladies, are you joining us on our trip to Apsan Park? We'll get some amazing photos. Great thing to add to your college applications, and there'll be other astrophysics professors there, along with many important member of the Night Sky Program. And I didn't want to say this to the group, because I'm entirely not certain, but I've got intel that Jung Soyeon could make an appearance.

Jung Soyeon teaches astrophysics at Seoul University. She won the National Medal of Science. She's a big deal. Meeting someone like her could help me get into MIT, which is where I want to study astronomy after I graduate.

Solbin draws in an excited breath and pokes my shoulder. "You have to come now."

"I'm supposed to be camping with a friend," I tell the professor, suddenly filled with doubt. Why can't anything be easy?

Dr. Choi runs his hair through his gray hair. "That's a shame. Where?"

I relay the details that eomma shared with me about the glamping compound.

Dr. Choi scratches his chin. "I think I know which one you're talking about, and it's not far from Apsan Park." He slips a piece of paper out of the front pocket of his rolling case and hands it to me. It's an information sheet on the trip. He points to the map and shows me the general area of the glamping compound in relation to Queen's Forest and Apsan Park. "Probably a couple hours' drive on the highway. Maybe you could stop by. We'll be there 3 nights."

"You can meet me there," Solbin says encouragingly.

"I'm not sure what the transportation situation will be like, but I'll definitely check into it," I tell him, folding up the paper.

"We'd love to have you. Let me know what you decide." He raises two fingers to his forehead and gives me a loose salute before reminding us to be safe getting home tonight.

"You're going, right?" Solbin whispers excitedly as he walks away.

My mind flutter, and so is my stomach. "God, I really want to."

"Then come," she says. "Meet me at Apsan Park. Promise me, Suzy."

"I'll try," I say, not completely sure, but hopeful.

"Star party, here we come," she tells me, and for a moment, it feels like old times between us.

But after we leave the auditorium and she walks me to the parking lot, I remember what awaits me at home.

I push away the dread and concentrate on enjoying the drive as I leave the observatory and descend into town. It's a perfect summer night, and star blanket the sky. My stars. Every winking point of white light belongs to me. They are wonderful, the town is quiet and dark, and I'm just fine.

Only I'm not.

Normally, I love driving eomma's car, even thought it's several years old and smells faintly of cherry blossoms. The stereo speakers are loud, and I relish taking the long way home, cruising the road between the freeway and the dark blue water. Expect for the occasional run to the grocery store, this is the only time I really drive. But, hey. At least eomma trusts me with her car, unlike my dad, who won't let me near his sport car. It's worth too much.

But now I can't stop thinking about that whole "one of many" line in that letter, and I wonder if my dad has driven other women  around in his stupid car. Just how many others have there been? I've always thought my dad was a decent person, if not a little plastic and fake when he's full-on Diamond Daniel mode, but now I'm picturing him dressed fancy with two curvy women on his arms.

It makes me want to vomit.

Dark silhouettes of skinny palm trees greet me as I turn into our cul-de-sac and park the car behind dad's car in the narrow driveway next to our building. The clinic is dark, so no one's working late. Hesitantly, I hike the steps of the connecting house and warily open the front door of our apartment.

A ball of white fur sits across the open living area to greet me. Damon is getting old, but he's still sweet and handsome. No one can resist his puppy face. I stick my fingers under his collar and give him a good scratch while kissing the top of his head.

"Hey, sweetie," eomma says. She's stretched out on the couch under a blanket, reading a magazine under a dim lamp while the mute TV flashes in the background. "How was astronomy club?"

"Fine." I hand her the car keys. "Where's Dad?"

She nods toward the balcony off the kitchen, where I spot a dark shape. "On the phone."

My gut twists when I hear his voice, too low for me to make out what he's saying. He's always on the phone, and those phone calls usually are taken behind closed doors after he steps away. I assumed he was just being polite; eomma is old-school about people talking on phones in public.

Now I wonder who's on the other end of the line.

Hoping she doesn't notice my anxiety. I briefly tell Eomma about Dr. Choi's invitation to the star party while she's flipping magazines pages. She's mmm-hmm-ing me, completely distracted. I see her look toward the balcony door, and a little line appears in the middle of her forehead.

Or maybe that's my imagination.

All I know is that I can't fake a convincing smile around my father, so after feigning weariness, I kiss Younghee good night and make an escape upstairs, Damon at my heels.

My bedroom is in a converted attic space. My parents' master bedroom is downstairs, so I have the entire upstairs to myself. Just me, an ancient bathroom without a shower, and a storage room filled with overflow supplies from the clinic.

Embarrassingly, my room hasn't changed a lot since I was a kid. The ceiling is still covered with glow-in-the-dark stars - the "glow" ran out years ago - painstakingly arranged to match constellations. Pegasus lost the stars that make up his leg during minor earthquake. The only decorative room additions from the last couple of years are my oversize handmade wall calendars, or "blueprints" - and I have one for each season of the year, and they are all systematically color-coded - and my galaxy photos. I've had my best ones printed and framed. My Orion Nebula is particularly beautiful. I took it at the observatory with a special equatorial mount borrowed from Dr. Choi, and tweaked its purple luminance with stacking software.

After locking my door, I move past framed star charts and duck under a mobile of the solar system that hangs over my desk. I stashed the photo book in a deep desk drawer earlier, and when I double-check, it's still there, under a neat stacked of graph-lined planning journals and a rainbow bin of highlighters, gel pens, and rolls of washi tape. My parents don't touch my stuff - it's all carefully organized - so I'm not sure why I'm so worried. I guess I just feel guilty.

Best not to think about it. "Until I can figure out what to do, it's out little secret," I tell Damon. He jumps up on my bed and curls into a ball. She's an excellent secret keeper.

The only window in my room has a Juliet balcony that overlooks the cul-de-sac. There's not room enough for me to stand outside, but it's wide enough for my telescope. I open the balcony doors and take the telescope from its black carrying case to set it up. I actually have two telescopes - this one, and a smaller portable model. I haven't really used the portable one much, but now I'm daydreaming about taking it to that star party on Apsan Park.

I wonder if I can really do the camping and the meteor shower.

It would take a lot of planning.

I dash off a quick text to Seolhyun: So, about this glamping trip. Who's going? Are you driving? What day are you leaving?

She responds almost immediately: Slow your roll. I'm in bed. Super tired. Want to go pick up camping gear with me tomorrow afternoon? We can talk about it then.

I'm both relieved and disappointed. Relieved, because I guess it's cool with her that I tag along. And disappointed, because thought I need to plan things well in advance, Seolhyun does everything by the seat of her pants. She's always telling me I need to lighten up and embrace spontaneity.

Spontaneity gives me the hives.

Literally.

I have chronic urticaria. That's a scientific name for chronic hives. They're idiopathic, which means doctors can't pinpoint an exact cause for why, when, and how long they flare. Sometimes when I eat certain food, touch an allergen, or - especially - get super anxious, itchy pale-red bumps appear on the inside of my elbows and on my stomach. If I don't calm down and take an antihistamine, they'll spread into huge welts off and on for days, or even weeks. It's been several months since I've had a breakout, but between Seolhyun and this thing with my dad, I can already feel an itch coming on.

I answer Seolhyun's text, asking for details about meeting her tomorrow. Then I assemble my telescope and set it up the tripod in the middle of the balcony's open doors.

As I'm adjusting the mount, I look over the balcony railing to scan the cul-de-sac. Viewed form up here, our street looks like a raindrop, its center filled with dozen public parking spaces. At night, they're mostly empty, so I have a pretty clear view of the other side of the street, where I spot Jungkook's car. It's hard to miss. He drives this black Nissan that's parked in front of a pale blue duplex house directly across the street from us: the Jeons' apartment unit.

I can't pinpoint the exact moment Jungkook morphed from the boy-next-door comic geek to the boy-in-black, but I guess he's always been a little odd. Some of that may be due to how he grew up.Before Namjoon and Seokjin got together, Namjoon used to take three-year-old Jungkook to a punk concert.

So yeah, he hasn't always led a so-called normal life, but he always seemed normal.

Until junior year, that is. After the night of homecoming dance, we didn't speak for days. No more hiking down to Sooji's Cafe to get coffee after school. No more night walks. Weeks passed. I'd see him occasionally at school, but our brief interactions were tense. He started hanging around other people.

Golden light shines from a window on the corner of the Jeons' house. Jungkook's room. I know it well. We used to signal each other from our windows before sneaking out late at night to meet up for walks around the neighborhood with Damon.

We made a game of creating and naming detailed routes. Jungkook would draw them all out, streets labeled with his neat handwriting and tiny sketches. He's drawn maps since we were  kids. Some were fantasy maps based on books he read; he redrew Middle Earth about twenty times. And some were of Daegu. That's how our friendship started, actually. I'd moved to Daegu and didn't know my way around, so he made me a neighborhood map of the Mission Street area. He gave me a larger, updated one for my birthday last year - one that included our  favorite late-night walking route, which extended out along a bicycling path curving around the town. It had funny little drawings, all the points of interest we considered important, and a legend of symbols he'd made up.

It's currently upside down at the bottom of the same drawer where I've hidden my dad's stupid photo book. I wanted to throw it away after we stopped speaking, but I couldn't make myself do it, because that walking route he drew? It's where the Great Experiment started.

Who knew walk could lead to heartbreak?

Out of curiosity, I screw on a low-power eyepiece and hesitantly aim my assembled telescope toward the Jeons' duplex. Just for a quick look. it's not as if I usually spy on all the neighbors. I quickly focus on Jungkook's room. It's empty, thank god. After an adjustment, I can see a unmade bed and, right beyond it, his reptile terrariums. The last time I was in his room, there were only two, but now there are at least six sitting on shelves and one big floor model. It's  freaking jungle up in there.

I scan the rest of his room. He has a TV and a million DVDs stacked. Probably all horror movies. An enormous map hangs over his desk. A map of what, I'm not sure, but it's professional, not one that's he's drawn himself - definitely not one of our late-night walking routes. Silly even to think it could be.

A shadow catches my eye as the door to his room swings open and closes. Jungkook walk into view. One by one, I watch him turn off lights and heat lamps inside the terrariums. Then he sits on the edge of his bed and begins unlacing his timberlakes.

That's my cue to leave.

Only, I don't.

I watch him take off both shoes and chuck them in the middle of his floor. Then he tugs up his shirt and pulls it off. Now he's bare-chested, wearing only jeans. I should definitely look away before this turns . But holy moly, when did he get all . . . built? I mean, it's not football-player physique, or anything. He's too lean to be buff. But he flops on his bed, lying on his back with his arms spread, and stares at the ceiling while I keep staring at him.

And staring . . .

There are now muscles where there weren't before, and his chest is a lot bigger. Is he lifting weights? No way. That is not him at all. He hates sports. He'd rather hole up with a comic book in the dark.

At least, I think he would. I suddenly feel like I don't know him anymore.

"Of course you don't," I whisper to myself. He's changed.

I've changed. Only I haven't, or I wouldn't still be looking at something that should be off-limits.

When I sharpen the focus, I home in on a stack of muscles rippling down his stomach as he sits up. And -

I pan to his face. he's staring this way.

Not in my general direction, but RIGHT AT ME.

Heart racing. I jerk back from the telescope and lurch to the floor. Smooth move. Like he didn't see me do that. If I had just kept a level head and shifted the telescope to the sky, I could've played it cool and pretended I wasn't really spying on him. But now? My humiliation is total and complete.

Good job, Suzy.

I lie on the floor, dying. Wishing I could take back the last few minutes.

Guess I can add that to the list of everything that's gone wrong today. Damon jumps off the bed and my nose in concern.

New plan: I am going on that glamping trip - and to the star party on Apsan Park - if it kills me. I have to get away from this place. Away from my cheating dad. Away from the daily mortification of living next door to a shop. And far, far away from Jungkook.