During the Joseon era, the story about the Crown Princess was arranged to be married to Lord Baek's son and the wedding will take place before the first crescent moon of the month but she secretly harbors feeling towards the late General's daughter who's also her bodyguard. An unfortunate event happens when the King sends General TaeYeon to a great war but she, unfortunately, dies until she begged to the Moon deity to gave her a chance to see the Princess herself before the Deity turns her into a grim reaper instead to collect souls, and for her final mission was to send the former Princess who was crowned as a Queen to her final destination.