Emperor Zheng Jue of Da'an was obsessed with Bai Yueguang Yunxili, who died young. He accidentally saw that his twin sister Yun Shuwan had the same appearance, so he brought her into the palace and named her Shu Guiren as a substitute.
After entering the palace, Yun Shuwan knew the identity of the substitute, but still devoted herself to Zheng Jue, imitating Yun Xili's words and deeds to suit his preferences. But Zheng Jue only used her indifferently and scolded her at every turn. On the anniversary of Yun Xili's death, he even made her kneel all night long. The imperial concubine Li Ruyue was jealous of Yun Shuwan and framed her many times, falsely accusing her of murdering Long Si and having an affair with an outsider. Zheng Jue never believed Yun Shuwan and punished her indiscriminately every time, which exhausted her sincerity.
Until Li Ruyue designed to cause Yun Shuwan to have a miscarriage, Zheng Jue mistakenly thought that she had done it on purpose, banished her to the cold palace and gave her poisonous wine. Yun Shuwan was so heartbroken that she faked her death and escaped with the help of her personal palace maid. She was rescued by Jianghu medical fairy Mo Ranchen, and she hid among the people and transformed into a cold medical girl, studying medicine with great concentration.
After Yun Shuwan left, Zheng Jue suddenly realized that he had long been accustomed to her existence, and his so-called obsession with being a substitute had long since become true. He was extremely remorseful. After finding out the truth, he deposed Li Ruyue, put aside his imperial power and went on patrol in secret, frantically searching for Yun Shuwan.
After many twists and turns, she finally found Yun Shuwan, who was practicing medicine in seclusion, but at this time, she was already as cold as iron. Zheng Jue put aside his humble status as an emperor to pursue his wife, and accompanied her to practice medicine to save people, ward off disasters, and even risked his life by protecting her from poison. In the end, can his sincerity impress Yun Shuwan?
True love has never been about substitutes, but about seeing and cherishing you as you are.