This is the universal problem in almost every manhwa
We still don't know what the hell happened or how haebom was "threatened" to decide to leave his bf
The victim blaming is crazy around ere
the way it was written is already inherently victim blamey but also generally out of character for BOTH of them. taesung is known to be very respectful and haebom's entire character growth arc was him not just going along with what people said, and it seems that way here. when he was approached, he wasnt even CONSIDERING leaving taesung. he was just considering what to get for him. either way two wrongs dont make a right. if he cheated that absolutely makes him wrong (granted, less than taesung), but the way it's written (multiperspectivity that is mostly from taesung as opposed to equally), it's obvious that the author is trying to lead us into hating haebom (and it's not working).
Haebom really do be annoying me, always letting people decide his life and causing problems for everyone just cuz he supposedly has low elf esteem. Like get the fuck up girl and fight for your man, you lazyass.