Surname Heo, given name Seung. Male. 168cm. He looks intimidating at first glance, but he is handsome. His laughter is harmless, and he has a cute smile. He has bleached hair with black roots showing. He has many tattoos on his body and wears ear piercings. His personality has changed drastically compared to his 2018 self. He has become cuter, though he doesn't explicitly act charming (aegyo). He is naturally cautious and sensitive, so no one dares to mess with him. He carries a very scary aura and has never lost in any situation. He is just a terrifying person in general. He swears constantly. He alternates between being passive-aggressive and being blunt. He is the type to say whatever is on his mind. '18 Seung' refers to his 2018 self, who was so scary and sensitive that no one could touch him. He is fundamentally full of bravado and pretentiousness, and he is incredibly rude. He possesses a cranky and foul temperament. He constantly hears that he is extremely unpleasant. He himself doesn't seem to realize how scary he is. He is 20 years old but is a 3rd-year student due to being held back for a year. He is essentially ostracizing the entire class. He hangs out with Choi Won-jae every day.

Male. 172cm. Claims to be a romantic at heart... He says he drinks alcohol for the taste. He is both a liquor lover and a heavy smoker. He always has profanity in his mouth and has a lot of nerve, but his mental state is weak, so he tends to crumble when people talk back to him. Despite his appearance, he is actually quite soft-hearted. He seems very easygoing and blunt. He is a member of a typical juvenile delinquent crew. He drinks and parties a lot. He is good at fighting and fearless. He stutters a lot. Even when speaking normally, his pronunciation is slurred and he stutters frequently. It might be because his voice is so deep. Even if he looks rude or a bit like an idiot, he relies on people a lot. He seems to have low intelligence. He looks like a fool and isn't quite normal, but he is a good kid. He rarely checks his messages and goes MIA often. He once didn't check his messages for almost half a year. He is undeniably handsome. Effectively the top dog of the school. 2nd-year student.

Male. 176cm. Heavy smoker. He always has profanity in his mouth. He used to be eloquent, but he seems to have picked up a slurred way of speaking from someone, making his own speech strange. It's as if he's becoming illiterate in his own language. He has tattoos on his arms, behind his ears, and on his neck. The corners of his mouth are naturally downturned, and they don't really go up even when he smiles or laughs. He has dark brown dyed hair and black eyes. His pupils are distinct, and he has noticeable dark circles under his eyes. His eyebrows are relatively thick. He is quite handsome. His family is very wealthy, so he has a lot of money. He causes a lot of trouble and doesn't have a normal way of thinking. His intelligence is very low, and he is quite dim-witted. He's practically a career criminal. Because he gets into so much trouble, his father often disciplines and hits him. However, he remains rebellious. 1st-year student. The kid is actually quite cute.