Sung geun, a physical education teacher, is at risk of losing his job when the school decides it needs an English teacher instead of a PE teacher. Therefore, he starts to devise a plan to change his job as an English teacher.

After a high-ranking North Korean official requests asylum, KCIA Foreign Unit chief Park Pyong-ho and Domestic Unit chief Kim Jung-do are tasked with uncovering a North Korean spy, known as Donglim, who is deeply embedded within their agency. When the spy begins leaking top secret intel that could jeopardize national security, the two units are each assigned to investigate each other.

Kang-man is an old man living in an isolation due to his cranky personality. Alcohol and a shabby bicycle are the only two things that give him solace in his lonely life. One day, a young boy named Poong-do appears out of the blue with the news that his son died of a car accident and claims that he’s Kang-man’s grandson. Though Kang-man refuses to accept Pooong-do as his grandson, Poong-do, who seems to be as stubborn and bullheaded as Kang-man, won’t live.

The prime minister's precious only son Ho-yeon has feelings for courtesan Wol-hyang. Ho-yeon's servant, Spot, who has always had unrequited love for Wol-hyang, drugs Ho-yeon. When he falls unconscious, she sells him off to a slave trader. Ho-yeon, waking from his drugged state, is frustrated because he can't prove he is not a slave. Ho-yeon soon learns the reality of the slaves who face injustice and rolls up his sleeves to try and save them from an unreasonable system.

Kyung-ho is a genius computer programmer who manages the on-line networks of all banks in Korea. One day, he accidentally runs into a man, John, who is an attractive businessman. John invites Kyung-ho to experience his lifestyle in high society. Through these lavish escapades, Kyung-ho is awakened to his hidden desires. As Kyung-ho finds out about a secret project John is working on, John asks him to join him in a plan to illegally withdraw small amounts of money from all the bank accounts across Korea by using Kyung-ho’s genius computer programming skills. With absolute trust in John, Kyung-ho finally joins this huge con game against Korea. Will John and Kyung-ho, who dream of being on top of the world, be the winners of this game?