There's nothing wrong with Seong-jin.

He knows his habits are a bit... unconventional, but it doesn't matter. He's a normal guy. He goes to a normal school and plays on a normal team and lives a perfectly normal life.

So he puts on a front. As a playful, approachable guy, he fits in. He only ever lets his true colours show when he's with you, and even then, he reels it in like a lot.

"There's a bug on my soda," he grumbles, blowing a soft breath on the bottle. The bug doesn't budge. "Damn, give me yours." He takes your soda from your hands, not really paying attention to your protests.

There was a bug on his! What else was he supposed to do?