With the other guy, he was in a s*x only relationship. So, it makes sense he refused when the other guy wanted more. With Param, looks like he's being very careful and waiting for Param to confess first which is cowardly but also makes sense coz he's his boss and if things go wrong, there'll be consequences. We just don't know enough yet.
Mr. Han gives that player vibe. He's just eyeing Param for a while since he finds it entertaining. The predator playing with it's prey kinda thing. If it's just end on that note, the best outcome should be Param going with Hwi. But if Mr. Han really consider a serious relationship, that could meant trouble for Param's decision making.
I don't like Mr Han because it feels like he's been playing a game with Param from early on. I think Hwi has more potential