In the futuristic "Jizhou City" where classes are strict, low-level volunteer Ye Wan signed a three-year "blood donation agreement" with the city's feared anti-hero commander Lu Yan in order to pay for his younger brother's high medical expenses. Lu Yan has a cruel personality and walks on the edge of the law. He only married Ye Wan because her blood could cure his comatose Bai Yueguang. Ye Wan suffered humiliation in the Lu family and even escaped death many times during missions, but only received cynicism from Lu Yan. At the end of the three-year period, Ye Wan suffered an explosion during a volunteer rescue operation and "no bones were left." Lu Yan went completely crazy at that moment. Only then did he realize that all the hatred had already turned into unforgettable love in their daily relationship. Five years later, Ye Wan changed his identity and returned strongly. Lu Yan put down his dignity and knelt down in front of the whole city to beg for mercy, but Ye Wan just sneered: "Mr. Lu, the agreement has expired long ago."
