Responses

There's no point crying over spilt milk. The deed has been done. The only thing he could do is to reassess his feelings and decide. If they're planning to date each other, it would be best to build solid foundation. That, of course, includes Param's resolve. If he likes Hwi then I hope he stays committed til the end. I hope he won't half-assed or change it halfway. However, if he still wants Mr. Han then turn Hwi down properly. It's that simple!
The least he could is to come clean. Uhm... not that he is obligated to tell him about what happened. Just, if he wants to keep seeing Hwi then communication is important.