I'm sorry, I love how passionate you are about it but I just want to say this.
No one is forcing him to become a criminal. No one is forcing him to resort to violence to maintain their relationship. You should never resort to violence. Or try and force people into something they clearly do not want.
There were other ways to go about it. He could of asked him to wait until morning to talk it through with him. He could of taken notice of the fact that Kyungsoo's mental state is not great right now and focused on caring and comforting him (in my opinion you shouldn't be pressuring a traumatised person into having sex with you. That's just taking advantage of them. Intentionally or not). Dong Hyuk was not mature enough to do them. Unfortunetly after the point that Kyungsoo leaves with Yule for the first time Dong Hyuk has become very unstable and irrational. You can see this in the way he rationalises things and how he rebounded with random guys when Kyung soo first left him.
By raping him Dong Hyuk has sunk to the level of Yule and his family (well.. almost...). He is abusing very vulnerable person who trusted him.
If Kyungsoo wants to end their relationship, even if you disagree, that's still his right to do so.
Why are you doing this to Dong-hyuk? Are you trying to make him a criminal by forcing himto resort to violent means to maintain a relationship with you? He's willing to go that far at this point. You, as a character are a victim of all kinds of abuse are going back to the Lion's den; not once, not twice but apparently three times??! Geon, in his attempt to redeem himself set you free and you're thinking of going back to your abuser? I have to congratulate this guy on being utterly incapable of making rational decisions at this point. A part of me can't even blame him, because he's that far gone. You should face your problems together with the one who is your beacon of hope. Don't betray him and make him crazy like Yule. Don't make Dong-hyuk into a criminal Author-nim! Don't make him the sad runner up in a tragic story that's already depressing to read... （/TДT)/
Also, go to hell, Yule! You crazy asshole! You have no sympathies from me! I don't want a happy ending for you. You screwed up every chance you had to maintain a normal relationship with Kyungsoo-ya and you screwed him up along the way with your crazy siblings. I want Kyungsoo-ya to be happy with Dong-hyuk; free from the evil psychological chains binding him to Yule and his crazy siblings. Both of them need serious therapy. Stop hating yourself for falling in love with Dong-hyuk. Yule, you asshole! This is your fault!!
(╬￣皿￣)凸