Although he didn't break up with Hyunil, he stopped having sex with Hyunil tho. Pretty sure he's just with Dojin since Hyesung and Hyunil's relationship doesn't involve any love or too deep feelings, just a dependent type. Hyesung wanted to maintain a relationship with Hyunil as friends but is afraid to say that he wants to break up bcuz Hyunil would definitely take it badly.
Yeah that's what i though, that Hyesung & his relationship with Hyunil is more like a family type & dependent one, because yeah he said that he would kill himself (Hyunil) if he broke with him & with Dojin he's a tsundere but is more posible that he finally feel something romantic for someone
Brake*
Omg i hated-loved this manhwa, it was a rollercoaster but it was amazing, this is the third time I read it & the "ending" was so freaking cute.
The only thing that I don't understand is the fact that Hyesung, is he still with Hyunil & with Dojin or just with Dojin, I don't really like this bitchi thing, personally i prefer their story in "Love is an illusion" (づ￣ ³￣)づ