Suh Yun-bok was a South Korean marathoner, who is best known as the winner of the 1947 Boston Marathon. Suh Yun-bok set the men's marathon world record of 2:25:39 in Boston Marathon on April 19, 1947. It stood 5.2 years, until Jim Peters's 2:20:42.2 on June 14, 1952. Wiki link