Champion (2018)

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Mark is a disgraced arm wrestling champion who was adopted by an American family when he was a boy. He’s a bouncer at a club and befriends a Korean student named Jin Ki, who has a knack for schemes to make money from any situation he’s in. Lured by an arm wrestling tournament in Korea and Jin Ki’s scheme to make a fortune from it, Mark comes back to his native country for the first time in 30 years. When he arrives, Jin Ki gives him his biological mother’s address. Hesitant at first, he visits the address and gets united with a sister he didn’t know existed, and embraced by a new family, he prepares himself to make a mark on the tournament. (Source: KoBiz)