The Kramer couple are like the average American couple. Mr. Kramer (Dustin Hoffman Dustin Hoffman) earns money from work while Mrs. Kramer (Meryl Streep Meryl Streep) looks after her 6-year-old son Billy (Justin Henry Justin Henry) at home. Because Mr. Kramer was so busy with his work that he neglected his family, Mrs. Kramer ran away angrily one day, leaving behind father and son. Mr. Kramer was busy with his work on the one hand and taking care of Billy on the other, and his life was in trouble. Mr. Kramer is not good at housework and is taking care of Belgian appearances: the process of frying cidox for Billy for the first time is very scary; Billy eats ice cream when he doesn't eat. Mr. Kramer wants to stop it but doesn't know how to communicate. Fortunately, with the help of his female neighbors, Mr. Kramer gradually adapted to the life of a single father. Father and son are getting closer and more dependent on each other. At this time, Mrs. Kramer came back, she is already an excellent designer in New York. She came back to get Billy's custody back...