Is My Alter Ego a Ghost?

The most terrifying thing is not that there is a ghost living in the body. But... I gradually can't tell who is me. Until an unfamiliar pale face was reflected in the mirror, and the tips of his teeth glowed coldly when he smiled. "Lend me your body." Only then did I realize that one day the visitor behind the dark door of the mine had attached himself to my "second personality" and was a ghost who only regarded me as a "shell" - he was my second personality, but it was completely separated from my memory: he slaughtered the water ghosts occupying the old building in the middle of the night, and when I woke up I saw only a bed full of wet mud; he smashed the paper man who stole the soul in the funeral parlor, and I was kicked out as a madman. What's worse is that the ghost's enemies are lining up to come to my door: the resentful baby cries at my window, the hanging man clings to my bed - and I don't even know how much trouble he has caused. Now I only have two choices: find out where this ghost came from, or wait to be dragged into the grave by his mess. But he smiled again in the mirror: "Do you think you can control me?"