Introduction: The international security team encountered a human test of a mysterious drug in the action. Lu Fan (played by Tian Yide) suffered a mutation reaction after the injection and became the only survivor of the team. Half a year later, Lu Fan, who was working as a car repairer in Chinatown to hide his identity to take care of the captain's sister Xia Xiaobai, accidentally found clues to the double-headed snake tattoo. On the one hand, Lu Fan, who was pursuing clues, gradually discovered the secret of his body's mutation with the help of Zhang Zhaoxue, and the two became emotional at the same time; on the other hand, they were met by Yang Shangcheng (played by Zhou Yan) and Zhang Ruicheng (played by Lin Xue). Teamed up to hunt down. During the investigation, Lu Fan discovered that his girlfriend turned out to be the daughter of Zhang Ruicheng, the double-headed snake boss. In the face of love and family ties, whether Lu Fan can avenge himself as a teammate, the battle is on the verge...