Spoiler flipping alert:
It gets... soooooo much worse like i knew park sion was deranged but as of the novel. This is TAME in comparison.
To keep things ambiguous and short he crashes tf out on quite literally everyone. Tries to stab green hair with a fountain pen. Beats the living shi out of shin jeayoung aka secret helper and puts him in hospital to which out main character is quite obviously pissed and also hits him on the back of the head with a chair and punches him repeatedly whilst sion is chocking mc which all started because he didn't want to sit next to sion and decided to sit next to jeayoung as a way to get sion off his back... it HEAVILY backfired.
Um he... sighhh. Yes officially sion is a hugeeeee pitch BLACK flag and honestly him being a yandere + deranged kid due to his fd up family yhh i saw this coming.
Bro is monitoring mcs every move. Probably stalks him. He literally tries to beat up any student that talks to him and he quote on quote said "im not afraid of losing everything" because poor mc thought sion would try to save his reputation.... um no he didn't.
Wow