Su Yunxue, a modern emergency doctor, travels to the General's Mansion in the Yan Dynasty because of her mother's blue and white jade bracelet before she died, and becomes a concubine who was pushed into the lotus pond by her eldest sister and was poisoned by the cold pond. Within 24 hours, she used the plum blossom needle taught by her mother to suppress the poisonous hair, and awakened her identity as the "Successor of the Holy Medical Valley" - her biological mother was the last disciple of the Holy Medical Valley, and ordered her to keep the inheritance and find out the truth about her death.
Faced with the "tonic" persecution of her aunt Liu and the "witchcraft" framed by her aunt Su Huaiyu, Su Yunxue used modern knowledge of microbiology to see through the Xieye Ginseng decoction and cinnabar poison. She used silver hairpins to test the poison and datura pollen to counterattack, and gradually counterattacked: seizing the Medical Saint token from her aunt, revealing the truth that her mother was induced to have difficult labor; subduing the "Six Sons Camp" of the old general's palace and becoming the actual person in power in the mansion.
The "three-year contract" with Gu Hengzhi, the first pharmacist of Dayan (exchanging Tianshan Snow Lotus for the space-time array blueprint), allowed the two to go from testing each other to achieving mutual success - she helped him find memories of past lives, and he helped her guard the general's mansion. In the process, they discovered the bond from a hundred years ago: she was the master of the Holy Medical Valley, and he was a general who died in battle. In order to save him, she activated the time and space array to travel to the present day.
