what happened to white haired guy?

Remember last scene mr. park wearing a red earing, i assume that was the soul of the white haired guy, so if the soul is taken then i guess he is dead?

MC seme also took uke's soul but he's still alive... Is there a difference between a vampire & a human when taking ones soul?

It's explained.
When the demon takes the soul of a human, the human is his possession. I think.

So I think the guy is still alive and if the soul was destroyed then seolwoo would be dead.