Quick question but did yeom-ra really do all this because he loved MC's brother?

Right. That's probably it. Might as well speculate that yeom-ra wasn't good at showing it which was why he was driven to take the wrong approach? Poor guy. I was wishing that he didn't die just like that and instead finally resolved it one way or the other with the person he clearly had feelings for but alas

Right right!! It pained me to see yeom-ra cry and despair because he just didn't want to be lonely anymore. He did whatever it took to make the hyung stay with him even tho it was high-key fucked up. Really pity that man. I really wished that he wouldn't die and like be better and shi but in the end......༎‿༎

There was a red flower yet to bloom in the end, kind of implied that the flower might become Yeom-ra reborn, but without memories. This time, Yeom-oh will probably raise him and Yeom-ra won't be burdened by his past nor be lonely.