Bish he "loves" him that's why... Maybe he's just naive... Or a freaking M , ╮( ̄▽ ̄)╭that's it.
If u dont mind i share my opinion here. The reason why the uke couldnt fight back, maybe because he has weaken psychologically. He was too scared. Because this is a manhwa, the author didnt put much story about choi yul's background. About who is he, how about his family, his capabilities to hurt others, etc. I mean rape was not something you can forget easily. It was actually very scary, and painful, to the extend you'll be so scare and you hope somebody to save you. But noone came. You wont be able to fight back, because... They were overwelhmed you. At the time you were raped, the rapist will be too much stronger for you to fight back. You'll be just too scare to fight back. Thats all. Your logic maybe tell you to fight, but, no logic will be able to be activated at that time. Rape, everywhere is the same, no matter who the victims are. Men or women. It was the same. The feeling was the same. It just too scary, that i believe you will never hope it will happen to you.
And the uke didnt want that happen to dong hyuk. Choi yul will definetly do something to dong hyuk. Because choi yul is someone who can hurt others without feeling guilty. If i was the seme, yep- i deffinetly couldnt fight back. Deffinetly.
Everything is messed.. Read the raws and what the hell is wrong with the uke he doesn't even fight back