After being betrayed by his fiancée and younger brother, Vampire King Kyle fled to the human world and was saved by Alaina, a down-on-her-luck heiress. To conceal his identity, he became her bodyguard—protecting her openly while secretly helping her reclaim her family fortune step by step. Deeply drawn to her blood, Kyle constantly struggled to suppress his craving around her, suspecting that Alaina might be his fated mate.