Yeah sure true, we wouldn't want someone we value to throw his family or basically his life just to be with us. Though Cain said to his family that even if he stays and live with them he won't feel real Happiness as his happiness is with Jooin. Even if Cain says to Jooin that he'll be happy even Jooin chooses to let him go and be abandoned it's still okay to him but, if I'm Jooin and chooses the latter it would still feel like wrong just like how he felt wrong when he learned Cain left his fam.
Such wise words, thank you, that exactly why Jooin is telling him to go back. We are not sure he in love with Cain but we do know he cares for him.
Regardless of how you think about Cain or Jooin, wouldn't it make sense for Jooin not to want Cain to abandon his ENTIRE LIFE becuase he loved him when he was a DOG? I would never want someone to abandon their family and restart their school/career JUST because they love me thats so fucking stupid. ESPECIALLY since Jooin isn't sure if he can return Cain feelings, that would just be even worse. Like thats not even blind love thats something only a child would think is okay to do. Like sure Cain is a "better" option but Jooin is thinking about his future