A world famous assassin, which was also known as the leader of the ' KESS ' organization, was shocked when he saw his old lover-a member of the ' KESS ', whom he promised to marry long ago, married to another man. Not believing his lover's betrayal, he confronts her, only to be said as a ruthless killer who killed her relatives and friends. Hearing upon those words, he was heart-broken, and returned to his abandoned assassination journey, in order to get his revenge on his lover's betrayal one day. But little did he know that all wasn't as it seems on the surface . . . Will he and his lover find out the truth, or will it his lover die in his own hands before that?