The three Shen brothers rescue a little girl named Niannian by the seaside, and from then on, they gain a little sister. Niannian is well-behaved and sensible, and she can always help her brothers find seafood, giving the family's life more and more hope. Facing disturbances from the outside world, the three brothers always protect Niannian, while Niannian uses her innocence to bring warmth to the family. This story tells of the deep bond between siblings who support and protect one another through hardship, filled with warmth and hope.