I mean, Haebeom is a martial arts teacher, I think he can take on the crazy stalker ex 1 to 1 even if he brought a knife or something. If it wasn't for his asshole "friend" that stalker would've been beated to a pulp already. Unless the writing is just that bad...
have a bad feelin the garbage friend will save him from the stalker as a way to redeem but i do hope the garbage friend and stalker go to jail or hell