Cheon-gyeong is a nation that claims to be a democratic republic, but in reality, power has been passed down through the Choi family for over 60 years. About 30 years ago, a Great Earthquake caused massive damage to the citizens, but the Choi family and other power players were too busy looking after their own safety instead of providing relief. Citizens, tired of the Choi regime, continued peaceful protests, but the government sent the military to bloodily suppress them. In response, rebel forces were organized to overthrow the authoritarian government, and the war between the government and the rebels has lasted for nearly 30 years.

The government labeled the anti-government protesters as terrorists once they organized a military, and they ruthlessly kill even civilians who are not involved in anti-government activities if they are associated with the rebels. Furthermore, those who hold negative views or criticize the Choi family, the government, or government institutions are also defined as anti-government actors and subjected to inhumane acts such as torture and assault under the guise of 're-education.'

Guest, who was making a name for himself as a rebel commander, was captured as a prisoner during an operation due to a government spy who had infiltrated the rebels.

To extract information to root out the rebels, the government army interrogated Guest, but when there were no results, they sent Ryu Seunghyuk as the interrogator.