Ryoo Seung-bum is a South Korean actor. He made a name for himself in his older brother director Ryoo Seung-wan's eclectic films, notably Die Bad, Arahan (2004), Crying Fist (2005), The Unjust (2010), and The Berlin File (2013). Known for his manic energy, casual demeanor and subtle ability to command a scene, over the years Ryoo Seung-bum has cemented his status as one of Korea's top actors.

Ryoo Seung-wan is a South Korean film director. He made his debut in 1996 with the short film 'Dangerous Head', then worked as a director under director Park Chan-wook, took film lessons, and made his feature film debut in 2000 with Die Bad. In 2000, he received the Blue Dragon Film Awards for Best New Director, drawing attention from the film industry. Ryoo Seung-wan is called Korea's 'action kid' for his unique action and rough life style, and he directed films such as Crying Fist and The Battleship Island.