On the famous Highway 1 in Los Angeles, a bus drove away with a beautiful maple leaf rolled up. In front of the car window, En Zuo and his wife from Beijing were happily watching the scenery. They decided to spend the rest of their lives in this beautiful country. As the first generation of vested interests in China's reform and opening up, I immigrated to the United States for the sake of my children's future and living environment. His wife, Xiaofu, is a high-achieving beauty born in an artistic family. She is obsessed with Enzuo, a once unruly man. At this time, tragedies were frequently reported among Chinese families in Los Angeles. Overnight, Enzuo's wife and children were innocently murdered by the police while he was out at a party. Enzuo, who was originally kind, honest and uncontested, has since sunk into grief. He has blocked all contact and looks for fun in his wife's diary every day. His extreme self-blame and longing for his relatives have plunged him deeply into a painful whirlpool. The FBI police officer in charge of the case found him and told him that they had obtained information about the murderer. However, since this was a huge criminal group that had been tracked by the police for a long time, they were ready to seize the opportunity to close the network. However, the incident happened suddenly. Liang, a Chinese police officer who had penetrated inside, suddenly suffered a car accident, which completely stopped the entire case process! FBI police officers came up with a bold plan: Enzuo replaced Liang to complete the closing of the net. After learning the truth, Enzuo mustered up the courage to undergo temporary training in order to give an explanation to his wife and daughter. He and his partner, a Mexican policewoman, ventured in and successfully completed this extremely difficult and dangerous undercover mission.