When Lao Chen, a city cleaner, sweeps the streets at midnight, he always finds some "things that shouldn't exist" - a half-burned missing person notice that will be restored as new the next day; a broken mirror that always appears in the same place, but it does not reflect his face; a "help" written in dust that will disappear in the morning. Until he found a diary belonging to the missing girl deep in the trash can. The last page of the diary reads: "Don't pick up that mirror." That night, Lao Chen saw the girl's last reflection in the broken mirror.
