Heesung is too good for euihyun and he seems to like him. But he needs to just stay away because taeju is gonna beat him up in which he doesn't deserve. It's just that it so happens heesung is there during those times so it's just natural fir him to kinda help euihyun in a way. Taeju needs ti calm down since he can't always be there with eihyun and plus he doesn't really know what to do with eihyun. Because to me he just treats eiuhyun as his property so if he doesn't want others to touch him then he should just live with him.