In order to repay the kindness of her adoptive father and adoptive mother for raising her, she accompanied the young lady of her love sister into the palace. She knew that the palace was dangerous, so she was careful about everything, but she still couldn't escape the villain's plot. In order to protect the young lady, she got involved in palace disputes, repeatedly solved strange cases, and was incognito outside the palace. She was even more appreciated by the prince and favored by the emperor. However, her heart does not want to be bound within this palace wall. Where should she go? Just when she thought she had found her own happiness, she suddenly discovered that her identity was...