Qi Xiaofu is an autistic child, and his parents' marriage will also come to an end. One day, Qi Xiaofu unexpectedly met a stray dog, a child from the stars and a stray dog with the same bumpy fate, from mutual fear and rejection to slowly approaching, until they were interdependent and inseparable. After being forced to separate, the stray dog searched everywhere in the vast city, and passed by Qi Xiaofu many times but failed to see each other. Qi Xiaofu's condition became more serious, and he was finally reunited after experiencing various hardships and dangers. However, there is a sad story behind the stray dogs.