When a strange weightlessness phenomenon occurs in the city, security guard Chen Mo accidentally discovers the connection between the mysterious pocket watch left by his grandfather and the gravity anomaly in 1972. His grandfather did not die in an accident, but he was the person in charge of the gravity anchoring experiment. As a descendant of the "Time Keeper", Chen Mo became the key to stabilizing the gravity field. He and the curator whose identity is a mystery went deep into the underground experimental base to activate the energy nodes, but they were involved in a century-old entanglement between "timekeepers" and "scavengers". The family secrets hidden by his father, the seventeen tokens left by his grandfather, experimental subjects that can control gravity, allies and enemies that are difficult to distinguish between true and false push Chen Mo into the whirlpool of fate. He must collect all the tokens to activate the gravity anchor array, fight against the mastermind at the cost of "memory of blood relatives", and uncover the experimental conspiracy and family truth spanning half a century as the city floats to the sky in the countdown.
