Ten-year-old Kwong is struggling with the stress from school exams and parental conflicts. His love for the outer space provides a safe haven for him to escape from the cruelty of the world. Constantly neglected by his parents, his grandma is his only listener. But after grandma passed away, he becomes obsessed with Pluto. He feels as lonely as the ninth planet which has been excluded from the solar system. He believes that aliens will appear and take him to Pluto, where he will meet his grandma again. One day, Kwong disappears, leaving behind a voice recording astronaut stuffed toy that keeps all his secrets… His parents follow clues from the recording to find their lost son…