Delivery boy Lu Chen witnessed a murder while delivering food and was silenced. The moment of death triggers a "time anchor" that goes back to 24 hours before the crime. He tried to change his destiny, but found that every time he went back, he would trigger a new death chain reaction and involve the "Ouroboros" secret organization involving all walks of life in politics and business. As the number of backtrackings increased, he gradually discovered that he was not selected randomly - his father, who had been missing for many years, was the core scientist of the organization, and there was a hidden secret behind the heroine's bodyguard Qin Lan being ordered to approach him. The truth is far crueler than imagined: the fate of the entire city has long been written into a resettable "script."