The Grand Tutor has two daughters, the eldest Miss Si Nanwan and the second Miss Si Nanzhi, who have similar appearances. The king of Jin and his sisters were childhood sweethearts, and they have always had a crush on Sinanzhi. The emperor fell in love at first sight with Sinan Wan and summoned her to the palace as his consort. However, the Grand Tutor and his wife were afraid that Sinan Wan would not be able to conceive a dragon heir, so they asked Sinan Zhi to enter the palace as a maid to give birth on her behalf. One year later, the emperor set his sights on Sinan Zhi, and in order to protect him, the King of Jin killed his brother and seized power. After the King of Jin ascended the throne, the two of them arranged a marriage, but due to a misunderstanding, Nanzhi mistakenly thought he was his sister's substitute. Si Nanzhi ignored Gu Ci and couldn't please her even with her many dotes. Gu Ci wanted to make Si Nanzhi jealous, so he conferred the title of Imperial Noble Consort on a princess who was similar in appearance to Si Nanzhi and imprisoned her in the Glass Palace