Same Position

My name is Jiang Chi, an ordinary advertising company copywriter. On September 12th, my girlfriend disappeared. The last place she appeared in the surveillance was the abandoned lighthouse on the seaside. The old man guarding the tower only said one thing: She didn't come out. Three days later, I climbed the tower to find her. There is no one in the tower. But when I walked down the last step and pushed open the tower door - the world changed. This is still Shenjiang City, the streets, the sound of the sea, and the lights are all the same. There's only one thing wrong: in this world, "Jiang Chi" is a criminal policeman. And the real him just disappeared from this world before I arrived. I live in the position he left. During the day, I followed the criminal investigation team to investigate the case, and at night, I looked through the notes he left. The more I checked, the more frightened I became - one person disappeared in this city every year in mid-September, and every person who disappeared said the same sentence before his death: I am in another place, and I still have a life. A series of murders with a stab in the back of the neck, corpses appearing out of thin air, numbers on the steps written and crossed out, anonymous letters sent to me one after another... All the clues pointed to the tower and the 107-step spiral staircase in the tower. The "other me" who wrote these notes left a line of small words on the last page: "The mirror is counting my steps." Someone was counting him in the dark, and now, they were counting me. I had to figure out where she walked in, what was behind that tower door. Even after I leave - the one who comes back may no longer be me.