Lotte World Tower Int'l Skyrun held in Seoul

A runner competes in the Lotte World Tower International Skyrun 2018 in Seoul, South Korea, on May 13, 2018. Runners raced up the 123-floor, 2,917-step, 555-meter-high skyscraper, South Korea's tallest of the kind, on Sunday. (Xinhua/Wang Jingqiang)