Xiaolan (played by Lin Xiaozhai), a spirit of Isatis root who has lived in the herbal medicine village for a long time, accidentally rescued the medical officer Ajiu (played by Pan Yihong) who was able to break through the barrier of the herbal medicine village. Who knew that Ajiu was not only the respected "Nine Divine Doctors", but also had a hidden identity - Jiuming, the leader of Shangqing Division who captured herbal spirits. Xiaolan and Ajiu accidentally formed a soul-matching relationship of dying and being injured together, and thus started a cat-and-mouse game, which revealed the bond between the two in their past and present lives.