Woodcutter Li Bo lost his axe and offhandedly promised to marry off his daughter, and snake immortal Qing Chuan kept his promise to welcome the bride. Older sister Chun Tao found him different and refused the marriage, while younger sister Qiuyue kept her promise and entered the mountain, bonding with each other by heart to become husband and wife. Chun Tao grew jealous and pushed Qiuyue into the lake to impersonate her. Qiuyue returned after enduring countless tribulations, and the truth came to light in the village. In the end, Chun Tao repented and was punished, and Qiuyue chose to shed her spiritual essence to become a mortal, staying together with her husband in the countryside, proving the truth that true feelings cannot be impersonated and choices determine one's life.