Kim Taehyung rules over Daegu. Jeongguk rules over Busan. Two large port cities of Seoul. The two pack leaders and Alphas despised each other. Min Yoongi worked as an undercover assassin for Taehyung, hiding his real identity as a rare male Omega. But fate takes a weird turn and Yoongi finds himself in Kim Taehyung's worst enemy, Jeongguk's clutches and the seemingly attractive Alpha was supposedly his fated mate. As time goes on Jeongguk and Yoongi finds themselves in lots of trouble as another notorious pack tries to take Busan away from Jeongguk as well as his close ones. Will Jeongguk, the most powerful Alpha in Busan, succeed in protecting his city as well as his close ones or will things turn out to be much more complicated than he assumed? (Please bear in mind that this AU revolves around some extremely dark concepts which might trigger some. I'll do my best to put warnings in each chapter, though I've done my best to mention everything in the introduction. just a heads up, do not read and then go ahead to complain about it later. READ THE TAGS!) [STORY TITTLE HAS BEEN CHANGED. from maid killer to bitter-sour.]