Ren Dawang (Huang Bo) wants to train his son Ren Xiaotian (Rong Zishan), who likes astronomy, to be a pianist, which leads to constant quarrels between the father and son. One day, the mysterious alien Mozart appears unexpectedly. From then on, Mozart helps Ren Xiaotian start a life of "fighting wits and courage" with his father. What Ren Xiaotian didn't expect was that Mozart came to Earth for another mission...