Love but confusing??

I really liked it but I’m just confused by some things, like Hyunsung obviously felt lonely and mad after the stalker could so easily leave him after everything he did, so did he then tie him up so that he would feel less lonely but realised he was getting too close to him so planned to leave, or as revenge so that the stalker would become more used to him and dependent on him and then hyunsung would leave (he was planning to leave to the apartment) so the stalker would feel the same pain he felt??? But then he convinced hyunsung he was sincere and he gave him a chance.
Also, he said he was also stalking other people, but then he said hyunsung was his first- so did he mean he started stalking him first or he was the first he was intimate with??
And then that guy the stalker met up with and brought him back to his apartment, was he another guy he was stalking?? I’m leaning towards no because he didn’t seem to mind seeing him but then the stalker also said they’d all accepted it by then.
Sorry this is so long lol (￣∇￣")