Nobita inexplicably becomes a suspect in a high-speed hit-and-run and money laundering. All the evidence points to him, but he has neither a driver's license nor the money to buy a car. It turned out that his cousin Zhao Qiang had plastic surgery to look like him due to childhood jealousy, and carefully planned for many years to steal his identity and life, and also joined forces with criminal gangs to launder money. Nobita is in jail, but he has not given up hope. He discovered that Zhao Qiang was unaware of his mango allergy, locked his identity, and teamed up with detective Lao Li to pretend to be obedient and collect irrefutable evidence. Finally, when Zhao Qiang tried to escape from the sea, he cooperated with the police to wipe out Zhao Qiang and the criminal gang behind him, clear his grievances, and take back his own life.
