sentences:  The story is a parody on the legendary story of Wu Song from the Chinese classical novel "Water Margin" (水滸傳) and also the 2002 Hong Kong crime-thriller film "Infernal Affairs" (無間道).900 years ago, Wu Song and Lin Chong were best friends, just like their characters from "Water Margin".They were as close as brothers and swore to uphold justice together even in their next lives.