When hotel receptionist Yuna Gomez wakes up reliving her worst night shift, she sees a chance to rewrite history. The guest in Room 312, Luicy Smith, didn’t just disappear. Her music notes were wrong. As Yuna digs deeper, she uncovers a coded secret linking a wealthy heiress, her best friend and her husband. With surveillance footage altered and time slipping away, Yuna must expose the truth before history repeats itself...