This drama mainly revolves around the story line of Lin Ruo, the daughter of the left general Lin Fang, marrying Qi Wang Lu Junyi by imperial decree. Gu Shengjing, the third prince of Liuli Kingdom, who transformed into Xiao Bai, poisoned Qi Wang Lu Junyi and Lin Ruo, the newly married princess of Qi Wang Mansion, in order to disrupt the internal affairs of Daxing. He thought that he could complete his mission by killing Lu Junyi, but he found that Lu Junyi and Lin Ruo, whom he had carefully calculated, actually regarded him as a close friend, and he had fallen in love with Lin Ruo without knowing it. Lin Ruo and Lu Junyi fell in love with each other in the process of getting along. In order to save Lu Junyi, Lin Ruo did not hesitate to marry Gu Shengjing again in exchange for the antidote, and Lu Junyi also risked his life for the sake of his beloved and went to Liuli to rescue Lin Ruo. Gu Shengjing was moved by their true love, so he agreed to the national teacher to fight for the position of the crown prince in exchange for the antidote and save Lu Junyi and Lin Ruo.