I mean what Garam heard isn't anything he doesn't already know. Jaehyuk was pretty shitty when they first met. Him being a womanizer is no secret either. If anything Jaehyuk was gushing over Garam and stating how serious he was about him so I'm curious what issue is going to be (maybe that he called Garam ugly??)
What bothers me is that Jaekyung is fighting so hard to stay in Dan's life for his own benefit. He doesn't know why Dan doesn't want to associate with him nor does he care. It would be one thing if he recognized that he treated Dan so poorly and he's chasing him as a better man, but he doesn't even recognize what his feelings for Dan are at this point. If I were Dan I'm filing a restraining order because what the fuck do you mean you just moved in next door???