Yeojin groaned as she looked through her bag for the fifth time. Her newly bought pen is missing again. 

She just bought that! And it's the pen with the glittery frog designs! IT WAS A LIMITED EDITION FOR CRYING OUT LOUD! What matters the most is that, the pen is expensive and she cannot afford to lose it

But here she is, frustrated, again. That was at least the tenth time she lost a limited edition and an expensive pen. 

Haseul is definitely going to kill her. She saved all those damn money for nothing. 

She let herself fall on the floor and buried her face in the rug 

Hyunjin, who was walking by Yeojin's room stopped in front of the doorway. "What's up, kermit?" 

Yeojin sighed, "Go away Hyunjin" She said. She was so annoyed that she doesn't want Hyunjin to . 

"Aww, you're no fun. Come on bud. What's up?" 

Hyunjin effortlessly carried Yeojin up and made her sit on her lap. Hyunjin can be an to Yeojin sometimes, but Yeojin's still her baby friend. 

"I lost another pen, for the tenth time. The pen was so expensive that I used all my savings to buy it" 

The older girl hums, "Haseul's going to kill you for real." 

"I know!" Yeojin sniffled. She was so upset. 

"Maybe someone kept stealing it? You never know, I always steal pens from my classmates.. so.. maybe you have a robber in your class" 

Yeojin looks at her with a confused look. "You steal pens..??? I- nevermind." 

"But what if I just keep misplacing it? I don't want to accuse some random person in my class for stealing my pens" 

"You're right..." Hyunjin hums again "Then.. set a trap?" 

"A trap???"

"Yeah, a trap. You know? You leave a pen on your desk then wait and see who'll take it" 

Yeojin thinks for a second. "You know? I think that'll work.." 

~

The next day, Yeojin waited until they were dimissed. She wanted her plan to work perfectly, so she used all the money she has left to buy the most expensive pen she could find.

She really wanted to know if someone is really stealing it. "Come on, don't make me waste my money for this thing" She mumbled as she casually sets her pen on her desk and fixed all her things 

She closed her bag and stood up, leaving the pen on her desk on purpose. Walking out casually as if she hasn't left anything behind. 

Once she left the classroom she hid on the very corner and crouched down behind the wall. Waiting for everyone to leave. 

After 10 minutes, she was starting to lose all hope. She was sure that everyone had left already and she was ready to go back in the room to take the pen back and leave 

She sighed, she stood up and walked towards the door. Only to stop and crouch beside the door frame when she saw one person left inside.

Who was that girl again? It was Yeojin's classmate. The loud and cheerful one, who was it? She couldn't put a name on it

The girl's back was facing Yeojin so she couldn't recognize nor remember the girl's name at all.

Yeojin kept on thinking and thinking, so she could put a name on the pen stealer. As she was thinking, the girl slowly reached out to take the pen

"THE SUN!" Yeojin accidentally shouted and made the pen thief flinch. The girl turned her head and looked at Yeojin with a frightened look on her face 

"Shoot." Yeojin grunts 

The girl takes the pen and runs for it. The girl runs towards the other door at the back. 

Yeojin was taken aback but she stood up as quickly as she could and run towards the back door to block the thief's exit.

But, without luck on her side, the girl successfully and swiftly ran out before Yeojin could even fully block the door. 

"Damn it!" Yeojin grunted and turned her head towar