South Korean Moon Jae-in (C) of the biggest Minjoo Party attends a campaign ahead of presidential elections in Seongnam, South Korea, on April 27, 2017. The South Korean presidential frontrunner has widened a gap with his runner-up in recent opinion polls just two weeks before a presidential by-election to replace impeached President Park Geun-hye. (Xinhua/Lee Sang-ho)
