Ju Yeong-nbok volunteers to work for the North Korean army as a Russian translator. As the political climate in the North deteriorates, his sister flees south. Yeong-bok is worried that her defection will prevent his being promoted in the ranks of the communist party. He breaks up with his girlfriend because she is catholic in order to prove his party loyalty, but Yeong-bok still finds himself blacklisted.
Seong Ji-yeon, a female officer of the North Korean army, is discovered by southern forces on a snow covered mountain. She suffers from severe frostbite so she is taken to a military hospital. There she falls in love with a doctor, Captain Lee. However, when he is sent to the front, she is sent to try to survive the hardships of a POW camp.
Nan-hee is slowly coerced into a life of crime by her boyfriend, Park. She is trained in assassination techniques and sent to assassinate the head of the Special Investigation Unit. However she cannot complete her mission because she suffers from pangs of conscience and a deep attraction to the investigator.
