Kim Taehyung who is a mafia boss, A. K. A the beast. Has to take the revenge of the killer who murdered his parents in front of him. He lost his memory of his parents looks. He everyday tries to remember them. His grandmother told him who the killer is and has to marry Min Y/n the daughter of the unknown man. She was raised by fake biological parents and has a brother by blood who is still looking for her ever since he was young. Taehyungs grandmother have a big secret that no one knows. He doesn't love Y/n yet. Will he ever madly fall for her and show that he have a fear of losing her? "trust me darling, you can't."