In an effort to win back her superstar pianist boyfriend, chubby Mini Mo (Sammi Cheng) vows to lose 200 pounds over six months. Her ally in the impossible task is the equally robust Fatso (Andy Lau), who begins to fall in love with the ever-more-slender Mini. The new-and-improved Mini must now choose between two men -- the one who jilted her years ago and the one who has seen her through this arduous journey.