Love Captive to the Mafia Boss uncovers the story of a young woman who, in a desperate bid to save her beloved grandmother, agrees to a contract marriage with the son of a mafia boss. The beautiful young woman could have found the love of her life, but she was forced to make a design that considered her family. So, she agrees to become the wife of a man she barely knows. It appears she ties the knot with the impulsive man with a domineering nature. As the series evolves, we can witness the relationship filled with tension, passion, and danger, and naturally, she becomes a witness to the organized crime world. Her feelings start growing towards her new husband, but she constantly questions whether she can survive in this ruthless environment.