
I am really sick in the head for liking the ending

I assure you, you're not. It's actually a befitting ending for the story for 2 reasons
1) Sura is a god of war whose very existence means destruction, domination and death. So, Choah's fate was sealed when he caught Sura's attention
2) Their fates were intertwined and no matter what they did, they are bound to be together.
I think if you can see it this way, it makes it easier to accept the outcome.
Just a hunch, since Jaekyung saw a pic that Dan meet that coach he will think that Dan team up with them to sabotage him lol how shitty would that be
probably and he will take anger on Dan and Dan can't take it anymore and leave him. Jaehyuk will miss hin and realize that he love him
Damn right my friend!! and there's probably a flashback of Jaekyung's childhood days where he is weak and all,so on, to gain sympathy