Ya Nu

The Prince Commander of the North wants the daughter of the Shen family as his concubine. In order to give his adoptive mother a better life in her old age, the family's mute servant, Shen Yu, conceals his gender and takes the daughter’s place. But Shen Yu is afraid that once his identity is revealed, he’ll be executed. To his bewilderment and relief, he only attracts the attention of the Prince even more... but is that really a good thing?

(Source: Comikey)