Eucommia ulmoides (played by Guo Jinan) is a famous doctor in the capital. He was promoted to imperial physician and moved into the Forbidden City because he cured the difficult and complicated diseases of Empress Dowager Cixi (played by Luo Lan) for a long time. After becoming an imperial physician, Eucommia ulmoides became famous within the red walls with his wisdom and superb medical skills, and was trusted by the emperor and the empress dowager. However, Eucommia ulmoides saw the dazzling imperial spirit in the imprisoned Guangxu, and was involved in the cruel political struggle. Eucommia ulmoides has a wife, Hong Baihe (played by Jia Xiaochen), who is infertile and takes Poria cocos (played by Yang Yi) as a concubine. Who knows that Poria cocos is chivalrous and eloped with someone on the night of the wedding night. In order to fulfill this love and concubine, Eucommia ulmoides wrote a divorce letter to fulfill them both. Who knew that a few years later, Poria cocos and Eucommia ulmoides, who were abandoned by their lovers, reunited and became friends. The two cooperated seamlessly to repeatedly solve strange cases. After a long time, they really fell in love.