Countdown to 30: Looking Back to Go to the Bright Future with You

He is a useless detective who was relegated to the archives, and she is the only survivor of the serial murder case. Only when the blood-red number 30 appeared on their wrists at the same time did they know that they only had 30 days left to live. The only way to survive is to rely on 30 backtracking opportunities to return to the crime scene and find the murderer who is at large. But they didn't expect that every time they looked back, they would tear apart the deeper darkness within the police force, and the real murderer they had been chasing for three years had already been standing beside them...