You didn't miss anything LOL it's like Stockholm syndrome...or just bad writing
If you want GOOD Stockholm syndrome- well, I should say WELL WRITTEN Stockholm syndrome, theres one called Hwangyoungs Misery.
This is my humble opinion. I think that uke felt something for Garon since the first moments, not precisely love, but some kind of connection and Garon also did things for him, he obviously liked the uke but he's mentally ill as hell. I always felt like the uke was suffering for feeling something towards Garon although he hates him, so he tried to be with the brother, that's what he should've done, but not what he really wanted.
I've been reading this BL now and then but still can't figure out what triggered the uke's feelings towards the seme? Just few chapters ago he was still hating him to the point of choosing death rather than his company and now he's crying over him and begging to go back? What on earth did I miss?