Chen Mo, who is in Class 4, Grade 2, is extremely ordinary.
There is a strange school rule circulating in No. 3 Middle School in a certain city: at midnight, a mirrored teaching building will appear behind the library bookshelves.
His deskmate Zhao Yan suddenly disappeared, leaving only a note saying "It's 4:17, don't look back."
The police said he was transferring schools, but surveillance cameras captured him walking into a non-existent building.
Chen Mo sneaked into the library and accidentally gained the ability to peek into other people's memories.
You can enter the missing person's moments before his death from a first-person perspective, and see four-seventeen minutes under the gray sky.
Each time it is used, the notch on the wrist decreases by one, and the countdown approaches 49 days.
Others couldn't see the abnormality, but his school uniform began to wear out, as if he had really been there.
He was the only one in the school who heard the footsteps in the corridor and knew that "he" in school uniform was the most dangerous.
When everyone thought Zhao Yan never existed, he was still piecing together clues.
Seven classrooms hide seven puzzles that must be solved to survive.
And the night watchman's diary says: Is it still you who is back?
He will eventually enter the starting point classroom and face the truth of reincarnation——
Either become the new anchor or let reality collapse.
At four-seventeen he was no longer a student, but a night watchman.
