Lee Han (16 years old) is collapsing under the daily bullying at his Korean school. After his last shred of hope is taken away, he decides to end his life by jumping off the school roof. But death is not the end... it's a gateway to a strange world where he wakes up in the body of a 3-year-old child, carrying the memories of his previous life. On his first night, he finds himself in an endless white room, confronted by featureless beings, without fear, without pain... He must kill them or survive for 3 hours. The only condition to wake up: kill or survive.