A phantom sniper methodically assassinates key figures in a South Korean intelligence investigation. Special Agent Ryu and his partner, Lee, suspect North Korea's most lethal female operative, Hee. When a security breach prompts the theft of high-tech liquid explosive, CTX, from South Korean authorities, Ryu and Lee are certain there's a mole within their ranks. Deceptions are uncovered, loyalties questioned and two nations threatened in the thriller that smashed the Korean box office record set by TITANIC!