Bang Chan

This is the main catalyst for the revelation of his character. Seungmin, with his childish directness even in high school, constantly breaks down Bang Chan's protective barriers.

Bang Chan calls Seungmin "brat" "stupid" "idiot" "short legs" "short man" and gets angry at him, but at the same time he constantly thinks about him, admires his stubbornness (even though he hides it) and unconsciously tries to protect Seungmin.
Bang Chan's thoughts are the complete opposite of his words. He wants to be friends, he wants praise from Seungmin, but his pride and upbringing prevent him from being sincere. Bang Chan wants to impress Seungmin specifically.

Bang Chan is a classic example of "tsundere"

He's handsome, attractive, tall, strong, athletic, boxing, cautious, and a tsundere. He thinks Seungmin is very cute and blushes when he sees him.