Political thriller based on an actual event related to the declaration of martial law after the assassination of President Park in South Korea. Security commander Chun Doo-gwang and the officers following him organize a coup. Lee Tae-shin, a stubborn Capital Garrison Command commander who believes soldiers should not take political action, fights against Chun Doo-gwang. As the conflict between the two men grows, military leaders postpone their decisions and the Minister of Defense disappears. In this chaos, Seoul's long-awaited spring takes an unexpected direction.