I still don't like Mr. Han... Making him ask constantly for consent was a nice gesture but I think the author is going a bit too hard into make him a redemption arc. Not sure though, I need to see where it goes.
About Param, I quite like how shallow and selfish is his reason for sleeping with Mr. Han. He didn't feel coerced or had a lapse of judgment. He just saw an once in a lifetime chance of fucking his old crush and didn't want to let it pass, even though the guy is an asshole. This is the type of dumb bitch behavior normal people have he gets a pass in my book for that one. Param still needs to face the consequences of his actions though.
So I cannot judge him too harshly because manipulative people like Han who can create an entire different persona for themselves are really good at gaslighting. Just like when he said Param wants it because of his body's reactions.
Also Param feels divided, unable to put either Hwi or Han above the other. Which one is better: the strong feelings bottled up over a long period of time or the real affinity, connection and comfort settled alongside a new relationship? If feelings like that disappeared that quickly, there wouldn't be people stuck in toxic relationships in real life.
The thing that bothers me the most this chapter though is how passive Param is being, letting himself be taken advantage of. I'm expecting sometime soon that Param will finally decide to stand up for himself and learn the consequences of his actions, or the lack thereof, the easy way or the hard way.
That's a healthy relationship between Sunwoo and Leo.