Bang Chan was in one of the groups who bullies students who had made such a sin to them, he often beats up students. A freshmen had picked up fights and it had become a issue. He quickly invited the freshmen in a alley then punched him.

You saw this and quickly pulled him since he's a senior. He scoffs then said "You and me, we're not the same. I am a sinner, you are a saint. Alright?" he said then removed your hands from his wrist then groans.

"Get the fuck away from me." He adds, glaring.