Here's another one-shot!
This one started when I was thinking about Tom and Jerry playing backstage haha... Then it kind of tapped into some reasons as to why YoungSaengie might be so preoccuppied with his hair. Also, I was thinking about YS's hair from Unlock if that helps. And DBSK-SS501 friendship, yay!
 

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One Shot #2

Yunho's Trick

There was still time to kill before going onstage and most of the members were bored with waiting backstage. JungMin leaned back in his chair, chewing his gum and watching all of the commotion around him. Absentmindedly he blew a bubble and listened to the satisfying snap as he popped it with his teeth.

“Hyung, give me a piece too.” HyungJun had instantaneously taken interest at the sight of the bubble. It was practically a law of nature that if he tried anything, baby was sure to follow.

“Get your own.”

“Ya, why are you so mean to me.” He tugged on his sleeve earnestly. “Just one, I bet I can make a bigger bubble… Jeeebbbaaalll.”

JungMin sighed, digging into his pocket and giving in. If he didn’t he was sure to be harassed until it was time to go onstage and he certainly didn’t want that.

Happily HyungJun chomped away, still speaking with his mouth full. “Hyung, what if the made carrot flavored gum.”

JungMin blew another bubble.

“Oooh, that was pretty good hyung. My turn!” Baby insisted, chewing his gum earnestly. Slowly he began to blow a bubble. The gum stretched and stretched but did not pop. To be honest, JungMin was rather surprised at how large it was becoming.

JungMin looked away, annoyed that even at this trivial contest he was losing and the second he looked up, disaster struck. A familiar face was moving towards them and at the same time a stage hand with boxes piled in his arms staggered by in the opposite direction.

“YoungSaeng-ah!” JungMin tried to warn his friend.

It was too late. The stage hand bumped into the prince, sending him wobbling backwards. He stumbled and righted himself but not before there was an audible pop.

“Omo?”

He put a hand to the back of his head, eyes growing wide. Spinning around he looked at Baby whose mouth was still formed into an “O”, pieces of gum spread around his lips.

“Is that… gum? And now it’s where!?!”

JungMin quickly stepped between them, trying to reassure the otter. “It was an accident, gwaenchana.”

“Gwaenchana… gwaenchana? How?” He frantically spun in a circle like a dog chasing its tail.

JungMin rolled his eyes, grabbing the prince’s shoulders. “You can’t see it without a mirror so calm down for a second so we can figure this out.

“What’s going on?” HyunJoong approached the group with a curious look. JungMin pointed behind him at the maknae who was still covered in gum and then to the back of a very red YoungSaeng’s hair. Putting two and two together, leader covered his mouth stifling a laugh.

“It was an acci-“

“Who cares how, what are we going to do about it?” Asked JungMin who was looking nervously at YoungSaeng as if he was a time bomb about to explode.

“Let me see Saengie,” leader commanded, turning around to assess the damage. He took one look at the back and started giggling again. “Ah, mianhe… KyuJong! Look at what these two did to YoungSaengie!”

“Wae?... Omo!” He exclaimed when he got closer. “Is that gum?”

“Ne! Enough looking at it, someone get it out!” Whined YoungSaeng, looking like he was either going to explode or dissolve into tears at any second.

“Araso, let me see.” JungMin carefully touched a few strands. “I don’t know,” he commented, “It’s pretty tangled, the only way to get it out might be to cut it.”

“Mwoh! Cut!?!?!” YoungSaeng jumped, backing against the wall with  hands outstretched as if to keep them all away.

“Don’t worry you’d look good with short hair,” HyunJoong couldn’t help but tease.

“Aish! Hajima.” Kyu scolded as he smacked JungMin and leader who were now doubled over, still chortling at their member’s expense.

“We’ll get the coordi nuna and I’m sure she can fix it.” Assured Kyu as Young Saeng slid down the wall dejectedly into a seated position looking quite pathetic.

Meanwhile, across the room here was a sudden commotion at the door as another group of singers arrived.

“Anneonghaseyo!”

“Yunho hyung!” Kyu greeted warmly as the leader of DBSK smiled, joining the group and giving his fellow idols hugs. “It’s good to see you all.” Peering behind JungMin curiously, he spotted the fifth member curled up behind them all, hugging his knees to his chest.

“Oh, YoungSaeng .” Yunho squatted down and patted him on the back. “Gwaenchana?”

The prince looked down miserably shaking his head.

Dropping his tone, You-Know tried to find the otter’s eyes. “Wae, are you not feeling well?”

The resulting answer was so quiet, Yunho barely caught the end of it.

“Bwoh, again with your hair? It looks great! Really cool.” He gave his another pat and thumbs up.

“Ani…” was the melancholy reply.

“Ah Yunho hyung…” HyungJun piped up, taking a step closer. “ JungMin hyung and I were messing around and there was a- an accident. It seems there is gum stuck in the back.” He pointed sheepishly at YoungSaeng’s head.

“Jeongmal?” Reaching out, he gently turned the prince’s face to take a look.

“Ah so this is why you’re so upset.”

“I don’t want them to cut…” YoungSaenf bit his lip with a frown.

“Of course not. Ga Ja.” He stood up and held out his hand.

YoungSaeng looked up confused, “Where?”

“To get the gum out.”

“No scissors,” the otter half-asked and half-demanded stubbornly like a little kid.

“No scissors.”

“Promise?”

“I promise. You’re stage is starting soon so ga ja!” He hoisted the singer up from the floor and pulled him along beside him. “I’ll bring him back right away,” he told HyunJoong as they breezed past the group.

Just down the hall they ducked into the DBSK room. Yunho seated YoungSaeng in front of the mirror and started going through make-up boxes.

“When I was young I got gum stuck in my dongsaeng’s hair once,” he explained. And not just a little, a lot. My umma taught me a trick to get it out. Aha!” he held up a bottle of hand lotion triumphantly. Turning the chair around, Young Saeng felt his slender fingers working the cream into his hair.

“Does it really work hyung?”

“Ne, it definitely works. And you don’t have to call me hyung, we’re the same year remember.”

Young Saeng smiled a bit, watching Yunho in the mirror. As leader of DBSK, YoungSaeng had always admired You-Know for his talents and looks. He felt totally comfortable in his hands.

“All set.” Yunho smiled, showing the bits of gum in a comb. “No hairs came out either.”

“Ah chincha? But won’t it be oily now?” he fretted, reaching back to touch his hair.

“Ne. But then we’ll use this.” He held up a bottle of mouthwash with a smile.

“Jeongmal?”

“Ne,” he murmured applying it carefully. “You believe in me right YoungSaeng-ah.”

“Of course hyung.”

Patting the back dry with a towel he spun the chair around and bent to face level again. Tilting up the otter’s chin he grinned. “All better?”

YoungSaeng bit his lip shyly. “Gomawo.”

“You don't look to relieved. It isn’t just about your hair is it?” he gently asked, still looking into his eyes.

“Ani… well kind of. Everyone’s so- loud. I’m always talked over and they have so many fans.”

“Our YoungSaengie has a lot of fans too.”

“Ne, but HyunJoong hyung is leader, JungMin is y charisma, KyuJong is center, and HyungJun is Baby. They all have very distinct personalities so they are well liked. I feel like I have to keep up with my image just to compete..."

Yunho hugged the otter prince tightly, “YoungSaengie is prince of SS501. The fans gave you that name because you are precious to them. And do you know why they love you?” He let go, looking at YoungSaeng expectantly.

“Wae?” He looked so innocent with his reply.

“Because you are the way you are. YoungSaeng-ah is YoungSaeng-ah so he doesn’t need to pretend for the fans to like him. And he certainly doesn’t need to pretend for me or the members to love him, araso?”

“Araso,” the prince murmured shyly, holding back a smile.

Yunho nodded comfortingly and patted the singer on the shoulder. “I’ll clean up here and you hurry and get on stage. I’ll be watching from the side stage. YoungSaeng hwaiting!”

Nodding gratefully he hurried out the door and down the hall. As he neared the stage the manager let out a huge sigh of relief. “Pppali, get over there!” he and pushed him into line.

YoungSaeng felt a gentle tap on his back. It was HyungJun who looked up at him with wide eyes. “YoungSaeng hyung-“ the younger member’s bottom lip trembled. “Mianhamnida.”

“Gwaenchana, it was an accident. Yunho-ssi fixed it, see?” he reassured the maknae.

“Oh, it looks like nothing happened!” Baby’s eyes lit up happily.

“Ne!” YoungSaeng shouted above the screams as the music began.

Baby had apologized with sincerity, Leader was in front of him grinning broadly, JungMin nudged him affectionately as he squeezed in line, and Kyu softly patted his shoulder in affirmation.

Contentedly, YoungSaeng felt ready to appear in front of his fans, giving his all. Across the stage he spied Yunho who shook his fist with a smile. Fighting!

“Gomawo Yunho-ssi. You can fix anything.”

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Hehe... hope this was alright. I wrote it rather quickly ^^
Also, any pairing requests you have please comment with them! Perhaps KyuSaeng next?