A girl that has dated many men accidentally reincarnated as a lady from a marquis family. After her father died, she inherited his peerage and owns a castle with mesmerizing wealth. She also got a duke as her fiancé. But just when she thought that she had reached the peak of her life, she realised that everything is not as simple as it seems. All the treasures and money were stolen by her family and her fiancé that's in charge of the robbery case will soon investigate into her.