A young maid Duk Im is ordered to visit the late Royal Noble Consort Yeong’s funeral. There she meets the Crown Prince who also secretly came to say goodbye to his grandmother. Duk Im learns about the forbidden book which King Yeongjo despises because of a certain phrase, and is warned that she’ll be losing her head if she is to read it. One day, she hears that the book is kept in the Crown Prince’s library, which makes her worried.

The tiger is on a killing spree within the palace. Unlike any other animal, it is smart. It knows exactly when to run, stop, and hunt. Although Lee San struggles with hunting this tiger, he unintentionally gets help from Duk Im as he was fooling around with her by pretending not to be the Crown Prince. To stop further casualties, this horrid tiger must be stopped.

All the young maids start to panic when they see the tiger. Duk Im comes up with a way to help the maids escape safely. San saves Duk Im, who’s in danger, but for mobilizing the military in the palace without the King’s permission, San almost receives punishment. And those who want to dethrone the Crown Prince are about to use this incident to their advantage.

Duk Im is shocked to find out San’s true identity. She gets upset as she thinks he fooled her on purpose, and therefore, she tries her best to stay away from him. However, with her outstanding skills and cleverness, she gets chosen to be his personal maid. Meanwhile, Princess Hwawan is not fond of Duk Im and finds a way to frame her and punish her.

Just as the Prince’s Lecturer orders to kill Duk Im, San appears to save her. Claiming that he was clearly mistaken, the Lecturer begs forgiveness and San lets this incident slide for now. Today is the day of the coming-of-age ceremony for the court maids. Duk Im is also very excited to celebrate this special day. However, the Queen does not make the day enjoyable for both San and Duk Im.