Fang Cheng is the housekeeper employed by Gu Feng, a famous doctor at Qingyuan Hall. Gu Feng's son drowned in an accident. Old Lady Gu blamed Fang Cheng for the mistake, which made the latter very dissatisfied. In order to avenge the Gu family, Fang Cheng swapped his daughter Qiangwei, born to his mistress He Xiu, with the daughter of the Fang family, Rendong. In this way, the illegitimate daughter Qiangwei became the apple of the Gu family's eye and lived a life of worry-free food and clothing, while Rendong was raised by He Xiu and grew up in an extremely poor environment. In a blink of an eye, many years passed, and Rendong and Qiangwei both grew up to be graceful girls. By chance, Rendong returned to Qingyuan Hall as an apprentice, where she met a man named Han Chong. Qiangwei has always loved Zhengding, but Zhengding is gradually attracted by Rendong's intelligence and courage, which makes Qiangwei hate Rendong very much.