After the Substitute Marriage, the Sick and Frail Prince and I Deceived the Entire Family.

The concubine who was forced to marry as a substitute married into the prince's mansion. She thought she was an unlucky person who was sent to be a widow, but she found out that the prince who was rumored to be sick and about to die was not that weak after all. The two quickly formed an alliance after seeing through each other. While pretending to be sick and poor, they deceived everyone in the house while trapping all those who wanted to step on them one by one.