Eight young elites — a dentist, an entrepreneur, a café owner, a telephone operator, an architect, and others — are summoned by Chan-geun to one secluded place as murder suspects. Each must prove their innocence through their own alibi. But as time passes, one by one, they collapse—poisoned by an unknown toxin. Soon they realize there is no escape from this room.

They have only three hours.
If they fail to uncover the real culprit, they will all die.

As time races toward its end, the line between truth and deception blurs.
What will they choose to protect — their lives or the truth?

Set in 1944, at the end of the Japanese colonial era, the film unravels a dark conspiracy surrounding the independence of Joseon.