You is right in every single way, it's sad that his older brother turned out to be some sick psycho who needs therapy (perhaps all 3 of the siblings do). Though the MC did say that the older brother was more gentle, but it doesn't change the fact that raped is written across MC's face every single chapter.
Since the update, I do find that Yule is more likable compared to his older brother now... I don't think that Beef Bulgogi guy is gonna feature/show in the manwa anymore though (the guy from the beginning that MC wanted to date because he could finally forget about Yule, also the guy who witnessed horrible rape on his just recently titled boyfriend aka MC)

I'm for Oppa! Yule was never that nice to MC in the first place and I know it's a dominant personality that makes him act that way but Yule has always been horrible to MC without any valid explanation
So my vote goes to Oppa (unless he proves just to be as bad as his baby brother in this upcoming chapter)
Oppa, he hawt! (๑•ㅂ•)و✧ლ(´ڡ`ლ)