The National Secrecy Security Agency [NSSA]: South Korea's security agency involved with secret Military Warfare, Foreign Threats, Covert Operations, and

Won Ryu hwan a lieutnant of the North a best spy.His skills are wonderfull no one can beat him in his work.But one kid came into his life.Would he be able to finish his mission or will he fail because of one feeling in his heart.

Kris is a determined agent on training and was ready to receive his license. But this is put on a halt when he is assigned to take guard on a certain person named, Yixing, for being targeted for assassination from the enemy. Not given the reason why, Kris never questioned his orders and takes on the mission, yet finds himself confused when Yixing asked him to trust him when trust is something Kris was trained not to have.