"Chang'an, Chang'an." "I will definitely promise you Chang'an for the rest of your life." Wu Jun rebelled, and Chen Jun swept away. The orphan girl of the Wu family, Jun Changan, was taken in and raised by Jun Lichang, the miracle doctor of Cangyun Mountain, and his disciple Jun Qingyang. They got separated while investigating the plague. Due to fate, Jun Changan was transferred to the Wu military camp, and met his brother by chance. When the plague strikes, what will happen to Chang'an when she returns to her status as a princess?