That is Doyoon's body, he deserves to live too after all he went through, the real owner of the body was in so much pain, he deserves to be loved and find his own happiness. It's not that our mc Doyoon doesn't deserve to live cause he does too, but the body has an owner and if he were to come back the right thing to do is to give it back. Still, I don't think the real owner of the body will come back, there are no signs of any part of him still being alive, by now if he was still around Doyoon should've felt him somehow.
That is Doyoon's body, he deserves to live too after all he went through, the real owner of the body was in so much pain, he deserves to be loved and find his own happiness. It's not that our mc Doyoon doesn't deserve to live cause he does too, but the body has an owner and if he were to come back the right thing to do is to give it back. Still, I don't think the real owner of the body will come back, there are no signs of any part of him still being alive, by now if he was still around Doyoon should've felt him somehow.