Jeon Doo-Gwang (Hwang Jung-Min) is the commander of the Defense Security Command and founder of the secret military club Hanahoe. Over a period of 9 hours on December 12, 1979 in Seoul, South Korea, Jeon Doo-Gwang leads the "12.12 Military Insurrection" and orders the arrest of a general without the authorization from the president. Lee Tae-Shin (Jung Woo-Sung), who is a commander of the Capital Security Command, stands against the military insurrection.