Taxi driver Li Mi (Zhou Xun) keeps mumbling mysterious numbers, and passengers in her car have to answer her a question: Have you seen this man? Li Mi's boyfriend Fang Wen has been missing for four years, but in these four years he has been writing to her to inform her of his current situation. Li Mi, who can't find her lover, puts his photo in magazines for people to identify, and lives in great torture every day. On this day, she picked up a pair of drug dealers Qiu Shuitian (Wang Baoqiang) and Qiu Huogui who came from Yunnan to Kunming to wait for a deal. During the deal, the drug dealers found that the "contact person" inexplicably fell off the bridge and died. When they were panicking, they met Li Mi who came back to find money for them. Qiu Huogui hurriedly got on the car and tried to snatch the lost money from Li Mi and return home. Li Mi took the opportunity to call the police, but then Qiu Shuitian asked Li Mi to find his first love Xiaoxiang and let her go. The "contact person" who fell off the bridge here hit the front of Ma Bing (Deng Chao) and Feifei (Wang Ning)'s car and died. Ma Bing and Feifei were involuntarily involved in this murder case. Ye Qingcheng (Zhang Hanyu), the police officer who happened to arrest the Qiu brothers, and Li Mi discovered Fang Wen's whereabouts - Ma Bing and Fang Wen look exactly the same! However, Ma Bing was very indifferent to Li Mi's recognition. Li Mi had been waiting for four years, and this was the ending? Ye Qingcheng also began to doubt Ma Bing's true identity.