Champion

Chaem-pieon is a movie starring Ma Dong-seok, Kwon Yul, and Yeri Han. A Korean American arm wrestler goes to South Korea for a competition, and finds a sister that he didn't know about.
A former arm-wrestling champion raised in the U.S. returns to South Korea for a tournament that could return him to glory, but he finds his life complicated by the appearance of the biological family he never knew.