Underground (1996)

Two brothers, Hyuk and Bin, live in a small coal mining village. Hyuk, the younger of the two, works hard as a coal miner to make ends meet. On the other hand, Bin becomes a slave to gambling and leads a wretched life. Bin soon becomes a casualty of a greedy gangster named Kang-ho who wants to reshape the mine for profit-making facilities. Hyuk enters the world of underground fight ring to avenge the wrongful death of his brother.