A strange phenomenon has recently occurred in University C
Every morning at 4:30 a. M., There will be a knock on the door in the boys' dormitory.
After knocking for nearly 20 days, people ignored him.
Until recently, the knock on the door was no longer a knock on the door
it becomes a countdown to death
Gu Ciben has nothing to do with this matter
But he had previously investigated something related to him
So, he was involved in this killing game
However, things were far from as simple as he thought
Purpose: Detective