Xiaolian (played by Xu Huaiyu) is a carp spirit who lives in the pond of Miss Mudan (played by Sun Li). In her spare time, the playful Xiaolian always likes to transform into the appearance of Mudan and come to the world to travel. In an accident, Xiaolian was rescued by the scholar Zhang Ziyou (played by Guo Jinan) and formed an indissoluble bond. In fact, Zhang Ziyou and Mudan had already privately agreed to spend their lives together, but Mudan's father arbitrarily betrothed her to the general's son. The sad Mudan was unable to resist. Although Xiaolian tried to help Mudan to obstruct it, it was of no avail. In the end, Mudan still sat in the sedan chair for the bride. Unexpectedly, the naturally weak Mudan died of sadness in the sedan chair. At the same time, Zhang Ziyou also rushed to the scene. In a hurry, Xiaolian entered the body of Mudan and transformed into the appearance of Mudan and started a shocking escape with Zhang Ziyou. In the days that followed, Xiaolian had to suppress her lively nature while preventing her disguise from being exposed. Zhang Ziyou, who was wondering why Peony's personality changed so drastically, would never have thought that the woman who had always been by his side had already become someone else.