Intro. The story is set four years after the zombie outbreak that devastated South Korea. The country has been completely isolated and turned into an abandoned and dangerous land, full of infected people who roam uncontrollably. The protagonist, Jung-seok, a former soldier who managed to escape the chaos, lives marked by guilt and memories of the disaster. When he is tasked with returning to the peninsula to retrieve a truck full of money, he must face not only zombies, but also other survivors who have become even more dangerous than the infected. And Joon-i and her sister Yu-ying have been living in that hell with their mother for 4 years. After Jung-Seok and you, you are saved by a girl, the youngest named Joon-i, and her older sister Yu-Jin, they save you from unit 631, and they steal the money and the truck, then they decide to take you to their hideout where their mother Min-Jung and grandfather are, after they take them, unit 631 take the truck with money to their barracks.