An ancient artifact, the Biyun Xiao, is said to have been made by an ancient god for the lover he could never get in his life. It can only play one song, called the Biyun Ballad, which can make people fall into a fantasy, where it plays over and over again. The person they love most in this life dies in front of them, but they can't do anything about it. Leng Bixue, the sister of Leng Wuqing, the master of the Miracle Medical Valley, is full of medicine and blood, which can detoxify poisons. Luo Yunchen, the emperor of Xuanlong Kingdom, is poisoned and needs Leng Bixue's blood to cure it. After drinking the last glass of blood, whose heart will be ruined?