In the seventeenth century, the ancient Kellan family became the most powerful nobles in the English court. However, Mary Louise Kellan was sent to a convent after her birth.
Seven years later, without knowing her life experience, she was suddenly taken back to the mysterious Kailan Mansion by a noble prince. From then on, all the confusing and outrageous things in the palace followed one after another. Young Mary Louise has gone through various family upbringings, but from an ordinary and simple trainee nun to an insidious devil. One day, she finally discovered the most secret history of this family...