Running Wild (Hangul: 야수; RR: Yasu) is a 2006 South Korean film.
Jang Do-young is a homicide detective who likes to use violence when dealing with criminals, while Oh Jin-woo is a prosecutor who believes in the importance of data and evidence. After the murder of his younger half-brother Do-young and Jin-woo meet when Do-young interrupts a stakeout in an attempt at vengeance. The unlikely duo join forces to bring gangster boss Yu Kang-jin to justice, but find that he is too well connected. Being unsuccessful in bringing Yu Kang-Jin to justice the duo turn to violence in order to bring him down.
Running Wild was released in South Korea on 12 January 2006, and on its opening weekend was ranked second at the box office with 389,370 admissions. The film went on to receive a total of 1,016,152 admissions nationwide, with a gross (as of 5 February 2006) of $6,245,863.