On Our Wedding Night, My Substitute Bride Wants a Divorce

[Twin sisters + medical skills + harem + power struggles + doted on exclusively] Complete! She could have been a carefree, chivalrous wanderer, but instead she marries into the palace and forces Prince An to divorce her on their wedding night! She nearly leaves Prince An unable to have children. She seeks justice, treats the sick, takes on disciples, gets into trouble and saves people along the way! She even forces the sickly, obsessive prince to fight for the crown prince's position! She was a beautiful young lady raised in the inner chambers, but a twist of fate turns her into a servant to a secret agent. She washes clothes, cooks, makes the bed, warms it, and even gets pregnant with the agent's child! A case of mistaken identity between twin sisters sparks a marriage-swap scandal and sets off a struggle for power within the palace. Prince An had planned to keep a low profile and survive, muddling through life. But his own brother gives him no chance, closing in at every turn and trying to take his life. As a secret agent, he changes his appearance and hides his identity. For years, he's been plotting to avenge his mother's brutal murder!