The owner of Bubu Pharmacy and Qiqi's guardian, Doctor Baizhu is a master of the medicinal arts and the latest recipient of a generational contract with a white snake named Changsheng. He seeks to achieve immortality to ensure he is the last to ever bear his contract, saving potential inheritors and even Changsheng herself from the cost that comes with its power, qiqi is an 8 year old girl with memory lost who was abandoned by her parents before baizhu took her in