Zhang Yimeng, who lives in the present day, is convinced that she is a princess who has travelled from the ancient state of Xi, and she tries by all means to return to the past. An unexpected faint brings her back to the ancient state, where everything feels familiar yet strange.
Bao Rou Rou is a mermaid who sets out on land to find her relatives. She is tricked by the divine detective Gu Xing He into becoming his crime-solving partner. A madman who investigates a case meets a mermaid girl, and the two work together to solve a series of mysterious cases and the shocking conspiracy behind them. However, due to being framed by others, a long-lasting relationship turns into a tragedy of love separated by yin and yang.
University student Wu Wan Wan accidentally time travelled to a school in ancient times and disguised herself as a man in order to blend in. It follows a series of hilarious stories between Wu Wan Wan and her classmates Tang Wen Qi and Qi Shan. Together, they not only fight against inequality over family status but also work towards recruiting female students in a story about integrating modern education concepts into ancient academies.
Cheng Shaoshang, left behind by her parents who went off to war, faces challenges from a scheming aunt and struggles with estrangement from her family. Lacking love and security, she is cautious in choosing a marriage partner and meets three suitors: Ling Buyi, the emperor's adopted son; Yuan Shen, a talented figure from Bailu Mountain; and Lou Yao, an aristocrat. Despite a rocky path to love, Shaoshang remains steadfast. Her involvement with Ling Buyi leads them into a mystery surrounding his family and identity and together they confront a national crisis, growing through their experiences and upholding their ideals.