Disliked daughter is sent to get married to a cold rich man in place of her beloved sister.
Real daughter pretends to be a body-double/lady-in-waiting to an imposter noble daughter
Since her mother's death, Sana had been treated like a servant in her own home. She had been striving to find her place in a household without allies. Sana was forced to marry Faris, a prince with terrifying rumors, instead of her half-sister, who was doted upon by her father and stepmother.
The emperor, hearing rumors that "those who make a vow with a Xian and produce descendants shall never perish," arranged for Koumei to marry Meirin, a Xian. However, Meirin doesn't actually possess the powers of the Xian and is marrying Koumei in place of her older sister, Shenrin. Meirin fears she may be killed if this lie is discovered, but Koumei turns out to be different from the rumors,
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