Devil's Queen

"Did I just become a Devil's Queen?"
Princess Nardin came from a family where her father married off his daughters at age 20 just to get more power and wealth across the land.
She was the third daughter of her father and when she was twenty, she was married off just like her older sisters but her marriage was quite different from her sisters'. 
The first time she is set free from her father, she is sent into the arms of darkness. At first she thought she was marrying an old king who had numerous concubines but after her wedding, she realized she was actually married to his son instead. His son who was never rumored but believed to be a devil. The devil's mother secretly slayed anyone who would spread rumors about her son being a devil and so nobody ever spoke up.
Now Nardin must fight all she can to stay alive amidst the dangerous secrets of her husband and at the same time find her sisters who were never heard of after they were married off to their husbands but with her evil step brother, ex boyfriend and her dark husband in the picture can Nardin do this in time?