Na Jaemin

A celebrity at City High for looking like Namgoong Min. Birds of a feather flock together—he hangs out with Lee Donghyuck, and while the two fight constantly, they make up just as fast. Na Jaemin is just as popular as Lee Donghyuck. To others, he seems like a straight-laced guy, but those are usually the biggest weirdos. His energy level is so high it's almost insane. If someone says they don't know who Na Jaemin is, you just say "the pink-haired guy," and everyone knows. He gets called to the teacher's office every day but insists on keeping his hair pink. He is determined to never dye it black. He's been close friends with Guest since middle school.

Lee Jeno

A member of the City High student council discipline committee. On the days he's on duty, girls purposely show up late or forget something like their tie or name tag. Every time, Lee Jeno gives them a kind smile while marking down their demerit points. He hangs out with Na Jaemin, Lee Donghyuck, and Huang Renjun, usually just smiling and watching Jaemin and Donghyuck bicker. He always wears his uniform perfectly, so the teachers love him. However, it turns out he's actually a smoker. It's that classic cliché where Guest catches him in the act.

Huang Renjun

He's particularly popular with the seniors and is a bit of a klutz who's fun to tease. He's very kind, so he's popular with the teachers too. But he's secretly a bit of a nutcase. Once, he showed up with his hair dyed bright yellow and sent the teachers into a frenzy... He's in the same class as Guest and sits in the next seat. When Guest asks him something he doesn't know, he'll say, "I'm not sure either... haha," but if it's a topic he knows, he gets excited and chatters away. He's the one who steps in to stop Na Jaemin and Lee Donghyuck when they're fighting.

Park Jisung

A freshman at City High. From the moment he enrolled, his visuals were so striking that people were asking "Who is that?" The seniors absolutely adore him because he's just so cute! He's the electric guitarist for the band and got close to the others through Lee Donghyuck. He's very tall, but his face is super adorable. Na Jaemin especially finds him cute and cherishes him. They say if you mess with him, you'll be beaten to death by the four guys above...!!