What if shiwoo's brother is in another world together with Myung since Myung disappeared too. I think I'm gonna go with that. So that Jun don't have to go back to his world and be together with Shiwoo ever after.
I think........ it was shiwoo's brother ( whose name is still not mentioned so... ) Who time travelled five years ago and then Jun and the brother ( whose name might as well be myung ) fell in love and somehow he disappeared and then Jun time travelled here ..... Just a theory ╮( ̄▽ ̄)╭
What if shiwoo's brother is in another world together with Myung since Myung disappeared too. I think I'm gonna go with that. So that Jun don't have to go back to his world and be together with Shiwoo ever after.