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 ......
The Mo siblings from Nanjing move to Inner Mongolia’s grasslands, where they work with the Ulan Muqi troupe and local herders. Along the way, they face love, loss, and personal growth while pursuing their dreams.