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Why are people telling Jiho to go back?
He should honestly learn to make an honest earning and be independent. He needs to explore the world, gain experiences and be able to stand up on his own legs. He's even planning on getting proper education, which is an absolute green flag.
If he stayed with Woojung any longer, he'd be way more dependent on him than he already is. Not to just stay at home like a doll with no education or therapy waiting for his owner to come back.