Lu Youyou arrives at the Lu Group with her savings, hoping to hire Lu Shiyan to be her daddy for just one day. Using a keepsake she carries with her and the clues she has gathered, she discovers that she is the daughter of Lu Shiyan and the late Shen Nanqiao. After moving into the Lu family home, Youyou gradually warms the hearts of every elder with her unique childlike kindness and sincerity. She also helps heal the long-standing rift between Lu Shiyan and his father. As the family lets go of its emotional distance and begins treating one another with genuine affection, they celebrate Youyou's birthday together. What was once a distant and uneventful household gradually becomes a happy home filled with warmth and everyday family joys.