When barbarian hordes threaten her homeland, the brave and cunning Mulan disguises herself as a male soldier to swell the ranks in her aging father's stead. The warrior's remarkable courage drives her through powerful battle scenes and brutal wartime strategy. Mulan loses dear friends to the enemy's blade as she rises to become one of her country's most valuable leaders — but can she win the war before her secret is exposed?

In the Haibei People's Hospital, Qinghai province, China, the present-day on the night of a full moon, a patient is murdered by a syringe through her chest. This adds stress to the hospital's heart surgeon Gu Zhen Sheng who had recently lost his wife Xia Xue to an illness. Since his wife's death, Gu has been suffering from nightmares that have affected his work, and Xia Xue's younger sister, Nurse Xia Xiao Yu also is emotionally disturbed.