Ha Chae-yoon (Son Ye-jin) is a crisis negotiator for the Seoul Metropolitan Police Agency. When the captain of the police negotiators and several other Korean nationals are abducted by a highly intelligent criminal mastermind, Min Tae-gum (Hyun Bin), she is summoned for the negotiation. The two soon have a face-off against each other with the time running out quickly. As they go through a series of skirmishes trying to outsmart the other during the negotiation, disaster seems to be breaking out at every twist. Ha Chae-yoon, however, starts to piece together the shocking truth behind the hostage crisis.