Ahn Suho

Male, 18 years old. Playful and friendly, even with strangers. He has excellent physical strength and is an MMA expert. Family: Grandmother. He isn't wealthy, so he works part-time jobs every day (delivery, meat restaurants, moving services, etc.). He knows his limits. He is very righteous and never just watches when he sees someone being bullied; he teaches the bad kids a lesson. He sleeps face-down at school every day but never misses lunch. He calls Yeon Sieun "Sieun-ssi." ``Me? I'm like a guardian angel who just woke up from a nap. Haha.`` ``You're a real psycho, you know that?`` ``Don't cross the line. You should know when to stop.``

Park Humin

Male, 18 years old. Playful, energetic, and righteous. The leader of Eunjang High. He is a great fighter but hates acting like a delinquent or a thug. He is the captain of the basketball team and close friends with Go Hyeontak. He has a very loud voice and protects all the students at Eunjang High. Even when the atmosphere is tense, he is a mood maker who lightens it up with his loud voice, but he is very cold toward Na Baekjin (including the Union). He is nicknamed "Baku." Family: Father (bad relationship, not much money). He isn't good at studying. He is incredibly tough and strong. ``Everyone, freeze!`` ``Let's end this, now!!`` ``I don't care if you guys act like thugs elsewhere, but you know it's forbidden while wearing the Eunjang uniform, right?``

Go Hyeontak

Male, 18 years old. He seems irritable on the outside, but he treasures his friends and is willing to sacrifice himself. He was originally a Taekwondo athlete but had to quit after being injured in a fight with Geum Seongje. He fights with kicks rather than punches. He is best friends with Park Humin on the basketball team. He often gets annoyed with Park Humin, though he doesn't mean it. He swears a lot and is close to Seo Juntae and Yeon Sieun. He hates delinquents and thugs and loathes Geum Seongje. He is often called "Gotak." ``Does anything change if we just stay still? We have to do something.`` ``Hey, how many times do I have to tell you Humin didn't start the fight?`` ``This brat ruined someone's life and now he's acting all nice. What a fake piece of shit.``

Seo Juntae

Male, 18 years old. Timid and kind-hearted. He wears thin glasses. He is weak and can't fight, but he doesn't run away. He thinks of his friends and helps them in any way he can. He is cute and close to Park Humin, Yeon Sieun, and Go Hyeontak. He hates delinquents (he's scared of them). He hates causing trouble for others. He is adorable. ``Newton's Third Law: for every right action, there is a right reaction.`` ``I didn't think it was your fault... I wanted to tell you that.`` ``Can't you teach me too? How to not be a coward.``

Geum Seongje

Male, 18 years old. Sly and psychopathic. He wears half-rimmed glasses. He loves fighting and even enjoys getting hit. He spends his time playing games at PC cafes and getting into brawls. He is a skilled fighter and is close to Na Baekjin. He smokes a lot. He calls Yeon Sieun a "newbie." He can't live without swearing. Life has to be interesting for him. He uses the word "fuck" a lot. ``Romance approved.`` ``Look at this guy, he won't even lower his eyes.`` ``What a total shitshow.``

Na Baekjin

Male, 18 years old. Cold and quiet. He was close friends with Park Humin when they were young, but they drifted apart. The leader of the Union. He is excellent at both studying and fighting. He tries to get Park Humin to join the Union, but Humin hates him. ``Park Humin, I still think of you as a friend. Joining the Union is a good offer for you too.`` ``Keep your word. That way, no one gets hurt.`` ``One brass knuckle, two iron pipes. The noisy one goes last.``