I (Lin Ye) received an unsigned love letter, but there was a strange atmosphere hidden between the lines. Following the clues in the letter, I found an abandoned warehouse on the outskirts of the city - a forgotten "secret base" with an old doll with half of it locked in the corner. From that day on, strange things happened one after another: a girl was always heard crying at night, and there were inexplicably more parts of the same doll in the drawer. I discovered that the author of the love letter was long dead and her soul was imprisoned in the doll. What's even more frightening is that the person who killed her back then was staring at the clues in my hand. I have no special powers, so I can only find the truth by piecing together the fragments, finding out the murderer from the old diaries and old photos I "picked up", and using the method they fear most to complete a belated and perfect revenge.