On his daughter's birthday, a middle-aged man, Wu Daxiu (Choi Min-sik), was kidnapped and disappeared by an unknown person on his way home drunk. For this reason, he was imprisoned in a mysterious private prison for no reason. Wu Daxiu, who failed to commit suicide, watched TV every day and ate fried dumplings for three meals. Through TV, he learned that his wife had been killed and his daughter's whereabouts were unknown, and he was suspected of being the murderer. For this reason, Wu Daxiu began to exercise, determined to take revenge, and spent a long 15 years in prison. When Wu secretly dug through the wall, he was released one day and was able to see the light of day again. He desperately looked for the reason why he was kidnapped and imprisoned, and launched a crazy revenge plan. He met a young sushi girl clerk (Kang Hye-jeong), and with the help of his old classmates, he pursued his enemies and successfully punished the prison guard (Wu Dal-su). At the same time, the enemy behind the scenes, Lee Yoo-jin (Yoo Ji-tae), also surfaced...