Sihoo did nothing wrong but myeonghan was traumatized by sihoo. He was bullied because of him seeing the imaginary sihoo. Myeonghan had already moved on from the trauma but sihoo has been forcing his way to myeonghan, due to sihoo's selfishness he hurt those around him so i think thats why people hate him
I mean it was not his fault that myeonghan was hallucinating.... Sihoo was the victim who got hurt... And I don't remember Sihoo hurting people around myeonghan (Can you please give me some examples).. yeah Sihoo didn't like myeonghan's boyfriend (I don't remember his name) but him hurting anybody... The character who liked Sihoo.. wasn't he the one who tried to hurt myeonghan..
I'm lost... I'm so fking lost... I don't understand why tf people are hating on sihoo... Did I miss something (maybe I did) coz the way I remember.. Si hoo did nothing wrong for the mc to hate him.... So I need to know and I'm too lazy to go back and re-read the whole manhwa.. so please anyone who knows please educate me...