Watch Cat On The Roof for Free: How to Stream the Movie Online at 123Movies. . Xiaolong lives together with his grandfather and his cat in a little town in rural china. After graduating from elementary school, he plans to visit the city's middle school together with his two best friends Lele and Meimei. But Xiaolong's father wants him to move to Shanghai and visit a school there. Xiaolong doesn't want to leave so he runs away with his cat, and finds shelter on a deserted roof.