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. (thetvdb.com)