Gu Yebai, who was once a top surgeon, fell to the bottom after an accident. His daughter Niannian was the only light for him to survive. However, the three-year-old daughter suddenly suffered from a strange illness. She cried every night, had a cold body temperature, and had strange bruises on her body. Modern medicine was helpless.
Just when he was desperate, he inherited a dilapidated old medicine shop passed down from his ancestors - "Sanshengtang". When he stepped into the medicine shop that rainy night, an ancient inkstone turned into a mysterious book called "Netherworld Baicaolu" in his palm, and poured into his mind.
[The Netherworld Baicao Record has been activated, and you have become the 18th generation leader of Sanshengtang.
[Your first task: Identify the "yin evil" entangled in your daughter, and refine "Requiem Incense" to dispel it.
From then on, Gu Yebai's world was completely overturned.
During the day, he is a gentle dad who washes his daughter's hands and makes soup; after nightfall, he transforms into the mysterious shopkeeper of Sanshengtang, and the guests he receives are all "inhuman" beings from the shadow world.
An infatuated scholar who is missing a soul, a century-old ghost troubled by inner demons, a painting fairy parasitic in ancient paintings... Behind every strange "patient", there is a dusty past. He used the grass of the netherworld to refine the soul-transmitting medicine, healing the souls wandering in the world, and also looking for a glimmer of hope for himself and his daughter.
However, as he heals more and more "guests", he gradually discovers that his daughter's strange illness is no accident. The inheritance of Sanshengtang also hides a shocking secret. Everything points to a long-forgotten ancient contract for the coexistence of humans and ghosts...
