Gao Sheng (played by Zheng Shaoqiu), a young and knowledgeable scholar, was appreciated by Emperor Yongzheng and was finally appointed as the companion of Hongli, who was later Emperor Qianlong. Gao Sheng stayed in the Forbidden City for more than 20 years. He was not only the emperor's companion, but also solved big and small things for Emperor Qianlong. However, Qianlong was jealous of Gao Sheng's outstanding talent, so Gao Sheng lived comfortably without an official position. Ruyi (played by Yang Yi), a new maid in the palace, was quite liked by the emperor, but due to Ruyi's humble status and the majesty of the queen, she had never been able to succeed. At this time, Ruyi was accused of a false charge and was finally lost outside the palace and disappeared. Qianlong ordered Gao Sheng to chase Ruyi down. Gao Sheng took the opportunity to feel the outside world and came to Yangzhou City. Here he found Ruyi's whereabouts and met Su San (played by Deng Cuiwen), the owner of Wanhualou, a chivalrous prostitute. The two went from disliking each other to cherishing each other later, but things could not be smooth sailing...