The Deposed Concubine Survival Manual : Beside the Male Lead

She thought she might escape her terminal life after transmigrating in a novel, but, of all things, she possessed the step-sister who torments the female lead, Laureltiana. At this rate, she's estined to die helplessly as a concubine in an empire doomed to collapse! With information from her past life and of the original story, Laurel tries to figure out a way to survive. As a result, she managed to secure the spot next to Sherkan, the Grand Duke and male leade who would never die but… "I didn't expect to end up marrying a prisoner in the middle of a war." I didn't know that was the position of the male lead's wife ? And on top of that, an even greater ordeal lay ahead! "How can he be...