In the previous life, the heroine married the prince who was demoted from the capital and seriously ill on behalf of her eldest sister. In the name of preparing her dowry, her natal family took away the grain deeds and warehouse deeds left by her biological mother; when the deposed prince died, they blamed her for the grain shortage. She was expelled from the clan and eventually died while being escorted. It was only before he died that he learned that the so-called substitute marriage was never a temporary idea, but a sacrifice to divide the mother's property and cover up the old grain case.