Every few hundred years, the most powerful demon on earth—a snake demon—awakens, and the Yin-Yang Masters are summoned to the capital. Meanwhile, the Princess of the realm has her own plans, as she conspires to claim the demon’s power.
Zhao Pan'er is a smart and savvy teahouse owner in Qiantang, living alongside her two best friends Sun Sanniang and Song Yinzhang. When she finds out her fiancé left her for another woman of a high ranking officer after becoming an official in the capital of Bianjing, she refuses to give into her fate and decides to travel to the capital in search for the truth. On her way there, she crosses paths with both of her best friends whose lives she saves, and they follow her onward. Gu Qianfan is a commander in an elite capital squadron nicknamed "Living Devil". He is setup by the very people he swears allegiance to and must find out the truth behind a nefarious scheme involving the imperial court. When he first meets Zhao Pan'er, they don't see eye to eye, however this intelligent businesswoman has caught his attention and as they help each other, they get closer to their own goals.
Ruan Liuzheng returns to her hometown after seven years, and becomes a neurosurgeon at Beiya Hospital. However, she didn't expect to meet her ex-husband, Ning Zhiqian, who is the most experienced neurosurgeon. Ruan Liuzheng is no longer the weak and timid girl, and she shows resolute and determination in both her work and relationship. When they were in Africa to execute medical relief efforts, Ning Zhiqian was injured in a gunshot. Ruan Liuzheng didn't leave his side, and fought hard to save him from the brink of death. The two have gained a new understanding of life, and begun a new relationship again.
