Vivian Wang falls into a coma after a suspicious hit and run accident. Her only child, Yiyi, on the other hand, is told that her mother has abandoned her. While faithfully waits for Vivian's return, the 10-year-old girl has to overcome all kinds of hardships and obstacles. Every time she meets with a life-threatening danger, a strange power saves her from the peril. Yiyi believes her mom's blue straw hat is somehow responsible for her marvelous luck.