Estonian Slackliner Performs 120m Above Gwanghwamun

World champion slackliner Jaan Roose walked a 160-meter line strung between two buildings 120 meters above Gwanghwamun Square, performing tricks for a huge crowd below. The 33-year-old Estonian athlete, a three-time world champion, completed what was Seoul's first high-altitude slackline performance in the city center. Slacklining is an extreme sport where athletes balance on thin, flexible lines—basically tightrope walking for adrenaline junkies.