The Ghost continued to have nightmares at night, his memories from the past catching up with him again and again. He couldn't stand it, but he couldn't escape either. Moments from his past are still lingering in his memory for a long time

admitting that he could not handle it himself, the Ghost decided to go to a psychiatherapist

And so he knocks loudly on your office door, and then comes in without knocking, sitting on a chair in front of you

you were his psychotherapist