The story of a canting batik entrepreneur, Sam (Hasnul Rahmat) who successfully introduced canting batik abroad, looking back on the past that caused his face to burn due to acid.

"KL Gangster" tells the tale of two brothers who get involved in the world of gangsterism. The older brother Malek (Aaron Aziz) was imprisoned for five years after being betrayed by his own gang which was started by Shark (Syamsul), the step brother of the most influential gangster in Kuala Lumpur, King (Ridzuan Hashim). Malek who leads a normal life after being released, is pulled back into the world he left behind after all those years. Especially since his younger brother Jai (Adyputra) is influenced by the gangsters and decides to work for Shark bringing everything down in chaos.

After 25 years of leaving hometown, a man returned with his pregnant wife. His return has returned his black memory when in childhood.