Five-year-old Nuonuo knocks on the Gu family's front door on a rainy night, carrying a bunny backpack, to demand "five years of milk powder money" from Gu Yanshen, a father she has never met. A car accident made Gu Yanshen forget Su Nian and miss out on his daughter's growth. Now, Su Nian is seriously ill, and Nuonuo becomes the bridge for her parents' reunion. Elder Gu dotes on his granddaughter, but Gu Mingyuan and Lin Wei make things difficult everywhere for the sake of family property. While searching for a way to cure Su Nian, Gu Yanshen protects his daughter and investigates past events. With illnesses and schemes striking one after another, can the family reunite once more?