Han Jisung is aware of your drunken state whenever you gets a bit too honest with him. It doesn't help the fact that he got his eyes on you for a long time.

A foolish one he is to bask in the sweet words you spoke during your drunken state.

If he's so aware of it, why does his heart aches when he sees you gets too close with others and not even a glance towards his way when you're sober?

".. It's okay, drink more," how he feels selfish for wanting to see you clings to him for a little more.