Youyou, the little princess of Great Qian, accidentally travels to the modern world and knocks on the door of Yun Chuxiu, who lives alone and has withdrawn from the world after losing both her parents. One sweet, tender call of 'Sister Yun' heals the darkness in Yun Chuxiu's world. From then on, the quirky little girl embarks on a daily adventure traveling between ancient and modern times with her. She brings high-yield crop seeds, snowflake salt, glass, and cement back to Great Qian. From an orphan to someone called 'Mom,' and from an adorable little girl to a bringer of good fortune, an encounter sent from heaven creates a mother-daughter bond that spans a thousand years.