Although Wu You (Huang Xiaoming) has reached an advanced age, his IQ and cognitive level still remain at the level of a child. As his name suggests, he is as carefree as a child and curious about the world. Wu You is single and lives with his optimistic mother, Shen Liping (Lu Xiaofen). He becomes a senior partner in a success organization called “Sunshine Club” when his mother falls seriously ill. While his brother Wu Di (Zu Feng), a doctor, tries his best to cure his mother, Wu You chooses a very different path to save her. He firmly believes that as long as you let the sun shine inside, there will always be a miracle in life ……