In Shanghai during the Republic of China, the entire Lu family was buried in a sea of fire, and the orphan Lu Yanci returned from dormancy for twenty years to seek revenge. The enemy Duan Chengye has power over the salt market, while his daughter Duan Qingyuan is pure and innocent. A swallow mark affects the fate of the two families. Smuggling of salt and opium, collusion between government and businessmen, and Japanese interference, led to numerous killings in Shanghai. He holds the chess game of revenge in his hands and only secretly protects the daughter of his enemy; she is trapped in the family's original sin and is torn between love and hate. The truth about the fire in Jing'an Temple was revealed, the Duan family was overturned, and she took refuge in the misty alleys of Pingjiang. He holds a high position as a salt patrol and protects each other from a distance, making it difficult to see each other. A bloody old debt spanning twenty years, a forbearing and deep love hidden in the ancient alleys of misty rain, the swallows have fallen into the old nest, and the grudges will eventually find their way.
