In the 16th year of the Republic of China, in the French Concession in Shanghai, policeman Zhang Haoran found an emblem pointing to his fiancée Huang Kexi's family at the scene of a murder on a rainy night. In order to seek the truth, he was forced to get involved in the whirlpool of wealthy families, gang fights and transnational conspiracies. He survived in a desperate situation, searched for traces in the fog, and vowed to pay blood for blood.
