Lu Kai is a character in the movie School Children. "Children at School" is a children's drama film, directed by Yuan, starring, and Yuan. The film was released in Chinese mainland on June 6th, 2002. This film describes the story of an old man, a child and a puppy living together in the countryside.

The theme of Children at School is to face real life, pay attention to vulnerable groups and express humanistic care. The film firmly grasped the audience with sincere feelings, rich details and natural and simple narrative techniques. The film adopts a natural and simple narrative technique, which is almost simple. It does not attract people with complicated clues and fierce conflicts, but with rich details and sincere feelings. Open kindness and sympathy are in sharp contrast with dad's rudeness. These details play an important role in shaping characters, conveying true feelings and sublimating the theme of the story.

Lu Kai, a left-behind child, lives in the countryside with his grandfather and picks up a stray dog. After his grandfather died of illness, his parents who worked in the city had to take him to live in the city, but he was not allowed to bring his dog into the city. Kay was very sad when he saw the puppy running after the car.