The bell tower in the foggy city hides secrets forgotten by time. Seventeen years ago, a bizarre accident took the lives of seven children and also took away Li Xingyuan. His son Li Su, a forensic doctor, is troubled by this broken memory. Until a corpse appeared, the bronze gear under the seventh rib had been running for seventeen years, but stopped at this moment. "7-17" Is engraved on the surface of the gear. This number, like a key, opens the door to the past. And in his left ear, there was a faint sound of gears biting, as if telling an unknown secret.
The truth is more cruel than imagined. This is a puzzle-solving journey that spans time and space. Every turn of a gear may change the trajectory of destiny. Li Su must face his past, solve the mystery of time, and find the hidden seventh gear. And the truth may be inside his body, waiting to be awakened.
