Kim Kyu-tae

While working at a mercantile agency, Yong-bae is contacted by a wealthy lady who asks him to find her a specific house. He investigates all the buildings in the area until he finds the one she is looking for. At the house, the lady opens a door into a new world and gives him an offer he cannot refuse.

Hyunjun and Sawoo, close friends and rivals from the South Korean special forces, are recruited by the secret agency NSS. They both fall for Seunghee, the beautiful but lethal profiling specialist at NSS. When they are faced against each other in a nuclear terrorist attack, they are forced to make their final decision and Seunghee's formidable secret is revealed.