In the thick fog of the Wangchuan Valley, the little doctor Xian Nanzhi picked up the man in white who had lost his memory and named him "Afu". She taught him to know herbs and taste the human world, but he always protected her in the dark - letting the dead trees bloom to warm her heart, making the vendors give in to her wishes, and calmly clearing obstacles for her in times of crisis.
She gradually relied on this "weak mortal", but she didn't know that he was Fuguang Immortal Lord disguised to investigate the conspiracy in the immortal world. When the murderous intention came, she stood in front of him with a medicine hoe, but he waved his sleeves and destroyed the enemies. His immortal robe was stained with blood and he chuckled: "It's my turn to protect you."
A day and night companionship that started with deception hides the deep love that goes in both directions. Conspiracies are like a web, and gods and mortals have different paths. Can they hold each other tightly in the fog and solve the crisis together?