If you answer the "Jaein" truth invited to secret streaming broadcasts, the extreme survival quiz, a "fall quiz show" that can receive 1 billion , will begin. However, the question is different from expectations, and the sister is headed to the death of her brother "Jae -ha" who died in an accident. The bottom opens, the rope that tights the neck. The only way to escape is to reveal the truth. Three people who doubt each other and pointed to them as culprit ... Can they reach the truth or fall together?