What makes you say that? Yul clearly needed serious help and let's be honest, being in an abusive relationship does not help and you can't just go up to the person and be like "hey i think there's something wrong with you go see a therapist" Especially when it's emotionally abusive as well. Oh and the fact that she was scares of men and the condition worsened when FIRST, Yul tried to set her up to almost be raped and second locking her INTENTIONALLY with him in the storage room.
Yul is not innocent and Sian needed a green flag like Yujin. Yujin might've not been the most likable character but towards the end he proved himself to her and she needed a person she could lean on, not someone who would control her life.
I hope you see this reply and take a look at how obsession can be dangerous and not everyone can point it out especially when you're in an emotionally abusive relationship.
No hate (づ￣ ³￣)づ
Okay I'll say it again fuck that Blonde headed loser! He's a trash to society and Sian is stupid for not trying to help Yul at all when they were going out and fuck those two especially. All the one who supported sian, her mother and Yujin are all walking red flags and should die because we don't need them in society.
(╬￣皿￣)凸