Good friends(2013)

Original title: 좋은 친구들

K (Yeon Jeong-Hun), Tatsuya (Kazuki Kitamura), Joon-Oh (Lee Ji-Hoon) and Yuuji (Kim Young-Hoon) are best friends. They work for Sung-Ho's gang in a Korean neighborhood in Japan. A power struggle over their territory erupts between their gang and the yakuza.K, Tatsuya, Joon-Oh and Yuuji try to revenge the death of a gang member, but they are soon chased by the police. As a result, Tatsuya is arrested and the relationship between Joon-Oh and K becomes frosty. Meanwhile, K robs the yakuza to bail out Tatsuya and Joon-Oh tries to find the snitch in Sung-Ho's gang. They learn that someone is behind the series of deaths of their members. A plan for revenge is set forth.