Martian Child movie plot

Science fiction writer David Gordonsuffered the loss of his wife two years ago, and time doesn't heal his wounds, it makes him feel emptier. In order to relieve the loneliness in his heart, David decided to adopt a child. Of course, this decision was questioned and opposed by relatives and friends around him. Ignoring the opinions of others, David adopts a young boy named Dennis. Although Dennis is handsome and cute, he has a very eccentric personality. He claims to be from Mars. He hides in a cardboard box all day long, does not play with other children, and likes to take pictures with a camera without film. The arrival of Dennis has injected vitality into David's life and brought him a long-lost love. But as life goes on, David discovers that getting along with the Martian boy isn't easy   .