[He doesn't know what it's like to be a king, or to have people depend on him. (A Ghost King is not really the same thing - ghosts don't give a shit.) But he does know what it's like to be powerful, and to put his life on the line using that power for the benefit of others. He understands that.
So he just looks at Yuuri and sighs.] Okay.
[And then, sternly,] But you have stay in contact with me the whole time. And broadcast public, because if something happens to you and metal is flying everywhere, I'm not going to be able to get to you.