Choi Kang-Seok (Jang Dong-Gun) is the best lawyer at prestigious Kang & Ham Law Firm. He is promoted to a senior partner.

Go Yeon-Woo (Park Hyung-Sik) has a photographic memory and excellent comprehension skills. He dreamed of becoming a lawyer, but due to his poor background he currently works as a parking valet.

To pay for his grandmother’s hospital bill, he takes a job to deliver drugs to a hotel room. While in front of the hotel room, Go Yeon-Woo realizes that he is going into a trap.

Go Yeon-Woo is then chased by the cops, but he gets into the secretary’s office for Lawyer Choi Kang-Seok. At that time, a group of people are waiting to take interviews with Choi Kang-Seok.

He is going to select a rookie lawyer for the law firm after conducting the interviews. Go Yeon-Woo is then admitted into Choi Kang-Seok’s office.

Choi Kang-Seok senses that Go Yeon-Woo is not the applicant they called in for the interview, but he is impressed with Go Yeon-Woo’s intelligence & memory.

Choi Kang-Seok decides to hire Go Yeon-Woo as a rookie lawyer even though he does not have a license to practice law. Choi Kang-Seok’s decision could even place his own career in jeopardy.

Seong Gi-Hun (Lee Jung-Jae) gets fired from his job. His life is miserable. Seong Gi-Hun hears about a secret survival game, with a 45.6 billion won prize for the winner. He decides to take part in the game. Meanwhile, Cho Sang-Woo (Park Hae-Soo) is like a brother to Seong Gi-Hun and vice versa. They grew up in the same neighborhood. Despite his poor family background, Cho Sang-Woo graduated from a prestigious university and found a good job. He now faces a crisis, due to misappropriation of company funds. He decides to take part in the secret survival game with Seong Gi-Hun.