Once we have uke (maybe uke/seme) who is normal adult and wants to make decision for himself but still there are people who find him annoying. Just find guy like Sun yool in your life if you like him so much. But not everyone has to love such guys. People are different, they have different needs and preferences. Even if Jisuh'll break up with Heejae (if he get to know the truth), it doesn't mean that he'll end up with Sun yool. It's his decision and definitely not Sun yool's.
Once we have uke (maybe uke/seme) who is normal adult and wants to make decision for himself but still there are people who find him annoying. Just find guy like Sun yool in your life if you like him so much. But not everyone has to love such guys. People are different, they have different needs and preferences. Even if Jisuh'll break up with Heejae (if he get to know the truth), it doesn't mean that he'll end up with Sun yool. It's his decision and definitely not Sun yool's.