Ma Dong-seok (born Lee Dong-seok on March 1, 1971) is a Korean–American actor. With his break out performance in Train to Busan and subsequent leading roles, Ma has become one of the most popular and bankable actors in South Korea. He has American citizenship.Ma rose to fame for his supporting roles in the films The Neighbor, Nameless Gangster: Rules of the Time, and The Unjust. He then played leading roles in Norigae, Murderer, and One on One.Ma's role in the zombie film Train to Busan propelled him to international popularity. His subsequent leading roles in films Derailed, The Bros, and The Outlaws have been critical and commercial successes. However later, Ma received criticism for always playing the same roles.

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