I disagree. DG never pushed anything. If anything, he tried to get Jiwon to do things he wanted to do, such as picking a place he wanyed to have sex. He didn't even seriously thought Jiwon liked him until Jiwon became jealous of him talking MD. Jiwon broke his own rules...he said a lot of things and acted differently over someone he isn't dating. Also, why would anyone tell someone who is completely inexperienced with sex and relationships not to fall for them when they already admire them so much. This "sex only" was a fail from the beginning. DG was doomed to get his heart broken...it happens to everyone eventually, maybe not in this exact case but it does.
So, the deal was sex buddies with no attachment. It was made very clear from the start.. As much of a jerk I think Alex can be, I still can't put a lot of blame on him. DG knew what was up from the get go so he's responsible for his own heartbreak here. DG is pushing it at his own risk. I feel sorry for DG but only because he's hurting himself.
That being said, it's fun to watch the train wreck and hope for it all to get sorted. I'm also on that ship of wanting someone to enter DGS life as a rival for Alex to pull his head oit.