The cute 5-year-old Su Xiaobao was adopted by Taoist priest Xuanqing of Qingyang Guan since he was a child. She was born round and soft, but had a "koi constitution" - she could sense the luck of people, and she was familiar with the "Tai Su Medical Classic" because of her Taoist inheritance. At a young age, she could use mugwort foot soaks to treat insomnia and coarse salt hot compresses to relieve abdominal pain. She became the "little medical fairy" loved by everyone in Yunqi Town. The secret of being separated from her parents on a rainy night ten years ago was hidden in her personal sugar painting mold. In order to find her relatives, she clutched the koi pendant given by her master and went down the mountain to set up a stall. The children who cried during the consultation turned into laughter, and the sweet-scented osmanthus porridge cooked for her grandma filled the old street with fragrance. The warmth hidden in the market was quietly piecing together clues about her reunion with her parents... The medical knowledge is mysterious, and the koi fish brings blessings. Xiaobao uses the clearest kindness to write the path of healing and growth that belongs to the little medical fairy.