The story is set during the Joseon Dynasty, at a time when twins were considered as an ominous sign. Therefore when the Crown Princess Consort felt two lives growing inside of her she made sure to deliver her children in a safe place and saves her daughter's life. After the little prince got killed by illness, Jisoo was trained to take his place instead, finding her way back into the palace. But a king need a queen to reign. How will she hide her secret from her wife?