Two-and-a-half-year-old Tuantuan comes from an orphanage and unexpectedly catches the attention of the young Qi Cixi. Thanks to his efforts, Tuantuan is adopted by Qi Yan and enters the cold and quiet world of the wealthy Qi family. This mischievous and adorable little girl turns the peaceful Qi household upside down, filling it with warmth and laughter. Her aloof adoptive father, Qi Yan, her rebellious genius sixth older brother, and her gentle, refined doctor fifth older brother are all wrapped around her little finger. With her innocent and straightforward childishness, she gradually heals the years of estrangement between the Qi father and his sons. Kindergarten adventures and unforgettable parent-teacher meeting moments follow one after another, constantly breaking through everyone's cold exterior.