Responses
In my opiniom, both of them is at fault. Yes, Kanghee is definitely toxic but it's because of his insecurity just imagine that someone just date you because you look someone he used to like, and beside Seonjae didn't do any assurance that he really loves Kanghee, that Kanghee is not just a rebound. And every time Kanghee insecurity kicks in, Seonjae saw it but he just did nothing.
I like Seonjae and I feel like he can do better with a character that’s actually going to try and understand him? Kanghee is kond of toxic and hasn’t even had trust in Seonjae. If he did, he wouldn’t be so jealous all the time even though Seonjae keeps proving to him that he likes him. Idk. Just kinda toxic