Exactly, we all thought he had a grudge towards Kyubin, but in reality he was just trying to protect Seunghee. Seems he's socially retarded, so the way he offered help was to ask Seunghee if he'll help get revenge.
I also think his cousin has been pressuring him to get said revenge and he figured killing two birds with one stone. Until his priorities changed and he fell in wuv (≧∀≦)
Honestly I feel sorry for Seunghee, he’s so on guard with everyone he can’t open up and now a person he thought he could talk about stuff with is possibly becoming distant from him for reasons. Like yeah the older guy is sus in a “grooming the child” way but I don’t think he was gonna really do anything like ppl in the comments were suggesting he was up to something ╮(￣▽￣)╭
Seunghee might get hurt and end up more withdrawn from ppl *cough* Suhyeok *cough, cough*
Have to say what?? WHAT DAMN YOU?!
But yeah..... just gonna let that hang there
Suhyeok be like: “so um, you wouldn’t do this kinda thing for anyone else? Right??
SeungHee: ???? No....
Suhyeol (face expressionless but internally cheering): *yay! I’m special!”