The only thing you can rely on is your brain!
Kang Cheol-Joong is just an ordinary high school student, but one day he woke up and found himself locked in a secret room he had never seen before. In that hectic situation, He searched around and found an old MP3 player. What he learned from the messages left on the MP3 was the shocking fact that he was poisoned and that he had only three hours left to live.
Kang Cheol-Joong, who is usually a mystery quiz fanatic, tries to escape that secret room by finding clues based on the reasoning skills he has by doing quiz and games over the years. But unfortunatelly, expectations and reality are always different. With those poison spread in his body that made him vomit blood, with several mistakes he made, what clues that catches his eyes which will save him from danger?