University professor Satoshi Ando (Seiyang Ueno), who lost his wife in his early years, has been living with his daughter Kenai, who is studying in girls' high school. Unexpectedly, the sudden accident completely broke the quiet life of the Ando family. Kenai somehow fell to her death, and according to eyewitnesses, her death was suicide. Ando was hit hard by the tragedy, and he regretted not being able to notice his daughter's psychological changes. On this day, the girl who called herself Qixu (sunflower) came to visit, she brought Kenai's diary, the diary recorded the fact that the dead daughter was bullied, and the culprit pointed to the girl named Muchang Kui. Shocked, Ando began to pursue the truth, only to find that the girl with a face like a peach blossom had a venomous and cunning heart like a snake and scorpion. This film is based on the original work of Lu Zeyang.