Choi Yeon Woo (Yoo Jun) is a high school student and a “mono” – a person who sees the world only in a dull and lifeless black and white. But for every mono, there is a “probe” – a kind of soulmate who allows the mono to see the world in vivid color. Yeon Woo’s probe was a boy named Yoo Han, and the two developed a beautiful friendship that blossomed into romance. But as their relationship intensified, mysterious goings-on suddenly got very unpleasant for Yeon Woo, who eventually found that Yoo Han had disappeared, with his mother also vanishing. Yeon Woo vows to do whatever it takes to track down his “probe” and his mother. A classmate named Se Hyun (Hyuk) learns of Yeon Woo’s quest and resolves to help and protect him – as a close friendship develops between the two students. But Se Hyun hides a secret, and Yeon Woo could be about to discover the truth…
At some point in the distant future, a massive, catastrophic earthquake strikes Tokyo, causing the temperature of the Pacific Ocean to rise meteorically and the largest typhoon in recorded Japanese history to sweep toward the city and inundate it with water. The Tokyo Fire Department and its team of crack rescuers swing into action, and shortly after they do, a distress call arises from an underground subway station - with repeated indications of the rescue code, 252 252, and the exclamation "We Have Survivors." It soon becomes apparent that the local rescue squad must attempt to save the survivors, doing so at the expense of their own lives and safety. Written by Nathan Southern