Watch The Spy: Undercover Operation

Chul-soo is one of Korea's best intelligence agents and a negotiator who perfectly accomplishes any given mission. There is only one person in the world whom his negotiation skills do not work on, and it is his wife Young-hee. She, who believes that Chul-soo has an average white-collar job, disapproves of his measly salary and frequent business trips. One day, a mysterious explosion takes place in the middle of Seoul. Korean intelligence agency as well as other nations' intelligence agencies, search for the terrorists behind the scheme. Chul-soo flies to Thailand on a mission to rescue a person who holds clues to the incident. In Thailand, he repeatedly encounters an unidentified man named Ryan. Meanwhile, Young-hee travels to Thailand on a business trip and gets entangled with Chul-soo's mission. Will Korea's best intelligence agent Chul-soo accomplish his mission that holds the nation's destiny and save his wife at the same time?