tbh heejae isnt manipulating, jisuh is more manipulative but he doesnt even realize it
I'd really have to recommend reading the actual manhwa. I'm really enjoying it at the moment, and I usually hate the "blatant manipulator gets what they want" plotline too.
You can't always get a full grasp of everything just from the comments at the end of a chapter xD
Well I won't consider him to manipulating because the uke (Jihsu) keeps ruining his pace in a good way. I think it was the other way around lol because spoliers. And really he's not manipulating Jihsu. Jihsu agreed with it considering it carefully of course from his past experience. Read it, and you will understand especially on the latest chapter why the seme "wanted to" but couldn't really.
I stopped reading a while ago and just look at the comments every now and then. It seems to be progressing how I expected. Smh The manipulator always gets what they want.