Kim Myeong-min (39) is Agent Kim, a family man who lives contentedly with his wife and two children. He is disguised as a manager in a company that sells fake Viagra imported from China. Together with his three comrades, Agent Kang (Yeom Jeong-ah, 39), Agent Woo (Jeong Kyeo-woon, 29) and Adviser Yoon (Byeon Hee-bong, 70), Agent Kim was sent to South Korea 10 years ago for a special mission.