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SEOUL, SOUTH KOREA - MAY 09: South Korean President-elect Moon Jae-in, of the Democratic Party of Korea, celebrates with supporters at Gwanghwamun Square on May 9, 2017 in Seoul, South Korea. Moon Jae-in declared victory in South Korea's presidential election, which was called seven months early after former President Park Geun-hye was impeached for her involvement in a corruption scandal. (Photo by Chung Sung-Jun/Getty Images)

SEOUL, SOUTH KOREA - MAY 09:  South Korean President-elect Moon Jae-in, of the Democratic Party of Korea, celebrates with supporters at Gwanghwamun Square on May 9, 2017 in Seoul, South Korea. Moon Jae-in declared victory in South Korea's presidential election, which was called seven months early after former President Park Geun-hye was impeached for her involvement in a corruption scandal.  (Photo by Chung Sung-Jun/Getty Images)