Roxanne Gold, also known as Roxy, is just an average girl with aesthetic looks and a killer body every guy dreams about. But that's just her cover, because if satan's daughter was human, she would be the perfect example. Known for her ruthless and merciless behavior, she is the top assassin of her Japan Mafia, run by her family, based in South Korea. Accomplishing every tasks given to her smoothly, except one and that would be the devil's spawn itself....... Yoon Jeonghan. Yoon Jeonghan, with godly sexy looks and the body of every girls ambition of taking to bed, was the most furious and skilled assassin of the Korean Mafia. Along with his 12 other brothers, with him on top, they rule the whole base of South Korea. The two Mafias have been rivals since the start and none of them are planning on backing down any time soon. But soon a problem uprises, threatening both their empire, which resulted in them to form an alliance for the good of their family and empire. Would this alliance help to save the empires, or would the burning hate of the top two assassins ruin it and their empires along with it?