I love yeon character. At first it was so annoying of him getting clingy to a straight guy like seme. But i couldn't blame him. Kwon gave what yeon want and it makes him greedy. He just a normal being. After realized his one sided feeling and suffer from broken heart, he truly moved on no matter what seme do. He didn't easily accept seme. I don't wish seme to suffer much since his mistake was oblivious to his own feelings. He wasn't aware that he already in love with yeon. By the time his realization hit, he knew it was too late. It's quite similar to Incidentally Dyed By Spring's Love except yeon-oh has strong rejection compare to other uke.
Ps: i wish doc dan stop chasing jk and move on like this. I want to see jk chasing game. Had enough of his bs