Wikipedia
is a Japanese action manga series written by Izo Hashimoto and illustrated by Akio Tanaka. It was started to be serialized in Weekly Manga Action in 1998 and moved to Evening in 2004. It was discontinued in 2007 due to creative differences but returned in 2011 and ended in 2015. It tells a story of a boy who killed his parents and turned himself into a cold-blooded martial artist. The manga inspired a Hong Kong film adaptation that was released in 2007.
Shamo is a 2007 Hong Kong martial arts film directed by Soi Cheang, based on the Japanese manga of the same name. The film stars Shawn Yue as a student who murders his parents, and, while in prison, is trained to become a violent, professional fighter by a fellow inmate played by Francis Ng.