Responses
Well, it’s mainly bc he knows what Hyuk's goal is and since he’s the only one by his side, it botheres him that someone is once again getting in the way of his happiness like with his parents.
He did mention that he doesn’t mind him doing anything with anyone, as long as it isn’t Hyuk, since he knows what his objective is
Since when was being jealous over a partner living a life the involves interacting with people cute?
That would be very annoying for someone to be actually jealous because you have friends.