The movies follows the incident knows as the second battle of Yeonpyeong which happened in 2002, while South Korea is caught in football frenzy as the national team plays against Turkey for third place in the 2002 FIFA World Cup, the North Korean navy deploys two of their patrol boats towards the Northern Limit Line, a disputed maritime border near Yeonpyeong Island in the Yellow Sea. In the midst of its usual duties, South Korean patrol boat 357 finds itself under surprise attack.