University student Su Yan is grabbed around the leg by a five-year-old little girl at the school gate, who claims he is her father. Not only does she accurately reveal all his secrets, but she also points at the icy campus beauty, Gu Qingleng, and calls her Mommy in front of everyone. Su Wanwan, who has come from five years in the future, becomes the ultimate matchmaker, confronting romantic rivals, bringing warmth, and cleverly exposing schemes to bring the two together. She forces these two people, who previously had nothing to do with each other, to begin their daily life raising a child together. From bickering and mutual dislike to gradually falling for each other, nobody knows that this sweet-voiced little girl is hiding a tender secret about the future.