Park Cara is a rigid ruthless woman with double identity. To the world she's known as Park Rex, the southern mafia leader. A man with a stone-cold heart. Cara has kept her true identity as woman hidden. She was doing great until the mysterious nightcrawler, Byun Baekhyun became her personal bodyguard.      

Pain and suffering has been the chronicle of my life, until I met him. A man full of mysteries, blessed with extra ordinary abilities and the greatest warlock alive. Byun Baekhyun, the lord of the dark realm. ​​​​​

Baekhyun is a heartless Mafia, so it seemed. He sees life differently, is always money-conscious, and never gives a damn about anyone but himself. Love is forbidden in his life after his previous experience until his driver accidentally knocked down a poor girl.

All my life, I've only lived for just one purpose, and that is to kill Byun Baekhyun, the heartless Mafia Boss. Things suddenly took a drastic turn when I discovered that I am Baekhyun's betrothed bride.

Lee Yumi was unfortunately sold to the most dangerous southern mafia boss Byun Baekhyun, but things took a drastic turn. For the sake of revenge and to save his reputation, Baekhyun forcefully got married to her. Little did he know that his heart will betray him.

Baekhyun is a 26 years old vibrant, wealthy, young man who falls in love with Seoyeon, a 30 years old independent woman who happens to hate men due to her past experience with her ex husband.