While rehearsing for a Korean traditional play at Changdeokgung Palace, 13-year-old Hyunjuli stumbles upon the Moonlit Palace - a fantastical realm inhabited by strange and mysterious spirits, gods, and creatures such as dragons and talking mushrooms. Together with new allies like Mr. Squirrel and warrior Won, she must navigate this magical world to find her way back home. However, their journey is hindered by the cunning Blossom Lady who seeks to dominate the Moonlit Palace. With danger lurking at every turn, can Hyunjuli and her companions save their beloved world and make it back to their own unscathed?