"Why are you doing this to me??! I have nothing to do with you!" He pleaded for mercy as I took out a glistening black pistol. "It is because you killed my father."I replied with a deadly tone and pulled the trigger.
This story is about the revenge of the young and handsome Lee Ye-sung, who was brought up by his "father" Lee Jin-Pyo, who trained him to be a professional assassin to annihilate the five people in the circle of power of Korea who killed 21 men during their suicidal mission of infiltrating North Korea to avenge of the bomb attack on the President in 1995. Now, Yoon-Sung have to carry out the mission of avenging the deaths of the 21 men. However, as the story proceeds, Yoon-sung meets a beautiful and attractive girl, Kim Na Na and falls in love. Slowly, Yoon-Sung's heart weakens as his mission becomes more dangerous. Would Yoon-Sung still be able to carry out his mission? Another devastating truth awaits Yoon-Sung when he found out who his biological father was.