After being dumped by his fiancé, heartbroken Hong Kong police officer Fallon Zhu gains 200+ pounds. His superiors demote him to the job of escorting convicts to Japan. When ha convict in his custody mysteriously dies, he must team up with citizen Thor to solve the mystery.

An illegal immigrant from Mainland China sneaks into the corrupt British-colonized Hong Kong in 1963, transforming himself into a ruthless drug lord.