After getting dumped by his girlfriend, Fallon Zhu, an agile Hong Kong police officer with a high crime detection rate, mends his broken heart by indulging in food. He eats so much that he gains more than 200 pounds in just six months. When his superior, Superintendent Huang, assigns him to escort a convict to Japan, he ends up losing not only his belongings but also the convict. He then teams up with a Hong Kong citizen, Thor, to investigate the case of the convict's mysterious sudden death. Fallon is determined to solve the case, even as troubles continue to snowball and affect those around him.