Cao Chengxuan, the seventh son of the Cao family who returned from studying abroad, had to marry Lin Wanqing, the eldest daughter of the Lin family who was rumored to have killed three fiancés in order to regain the power of the family. On the night of the wedding, the bride put a gun to his forehead: "You can cooperate, but don't be sincere." From then on, the foreign market ten miles away in Shanghai became a chessboard for the couple. While they joined forces to fight against the covetous uncles, brothers and the Japanese Chamber of Commerce, they were frightened every step of the way in the real and fake tests. It wasn't until the secret contract was exposed that he discovered that she was actually the ace agent codenamed "Nightingale", and that this marriage was a top-level deal from the beginning.
