Elite Intelligence becomes a deadly weapon when former undercover agent T (Sang-Min Park) unwittingly becomes the sacrificial bait in a deadly agency operation and watches his government turn against him. Determined to exact revenge, T takes a crowded subway hostage and threatens to exact one of history's deadliest acts of terrorism -- taking the lives of 13 million civilians. As life and death hang in the balance, the single greatest act of courage falls to Detective Jay, who must face off with T in the deadliest showdown.