beta
param may have not cheated on hwi because technically, they were not dating when he slept with han, but definitely there was some sort of an "emotional" betrayal that happened.
imagine agreeing to a date with someone (knowing this person likes you) and then you fuck someone else the next day.
just like what olivia said on one of her songs, "you didn't cheat but you're still a traitor."
the fact that param was so guilty after doing the deed with han says something.