If he's able to smile that means he is healing. _ this new life is free therapy for him. I don't know about the depths of motivation as the ML seems to have different types of motivations driving him to protect and entertain the MC but he's doing quite well it seems ! (For me. ) I mean Yiseon truly needed a change in his life. And now he is grateful and feels a lot happier so i would understand why he would be ok to get closer to ML _ and yes ML has a dark side but he still looks like he is able to truly care and truly be dependable so wait and see . _ all i want is to see Yiseon happy as a bird . And it seems like a real smile ?? For once ?? He wasn't able to smile until now so i guess that's all that matters. Progress is progress !!
I would be uneasy about their relationship if the ML was isolating the MC but that's the opposite !! He opened up his world and introduced him to friendly and caring people. Their dynamic is relayed by the dynamic of their collegues who are very caring and appreciative people, this is in itself very healing and a security for Yiseon i think ? Don't you think ? ML is happy when MC is happy he's not trying to make him miserable or to keep him for himself, and he's truly helpful . (What did he do that you've found unhelpful ?) _ maybe he has a bit of shady thoughts so that makes us doubt and worry a little but that's because it's a softcore thriller. Yes the ML is a bit shady sometimes but until now i cannot say he is lousy or abusive.
I feel so bad for yiseon gosh, he deseverves better i thought he was finally healing himself but I was so wrong T_T it just got worse