It's about to get extreme! An amateur Blader teams up with a mysterious ex-champion, and together they aim for the pinnacle of the X Tower.

Go Nan Do, the owner, and creator of an IT research company must hide his existence from the world after his involvement as a hacker in a major case ten years ago. Presumed dead, the only people who knew of his existence are his step-sister and his companies CEO. Han So Yeon, an assistant manager at a glasses company, keeps her distance from people, due to her inability to recognize people’s faces.