Mafia boss Kim Taehyung, known as "the beast," seeks revenge for his parents' murder. Suffering from amnesia regarding his parents' appearance, he struggles with daily attempts to recall their faces. Taehyung's grandmother reveals the identity of the killer and told him to marry. So he arrange his marriage to Min Y/n, the daughter of an unknown man. Y/n, raised by adoptive parents, has a brother by the same blood searching for her. As Taehyung navigates this complex web, his evolving feelings for Y/n and his grandmother's concealed secret add layers of plotting. Will Taehyung overcome his emotional barriers and fall deeply in love with Y/n, revealing his fear of losing her? "Trust me, darling, you can't."