A top agent time-travels, becoming the 'Useless Heiress'. Abandoned by the Crown Prince, she marries the frail God of War, Prince Kaelan. She uses her TCM and martial arts skills to help Prince Kaelan recover and puts the Crown Prince in his place. Entangled with Prince Kaelan, she clears her name, and he discovers she is his 'one that got away'. They expose the Crown Prince's conspiracy, reveal her identity as a princess from the Kingdom of Ceylon, quell war, and achieve their happy ending.
