A man becomes involved in a memory manipulation operation to try and regain lost memories. He thinks the exercise may help repair his failed marriage, but accidentally ends up with the mind of a serial killer.

Hangzhou, Zhejiang province, China, the present day. Master chef Tang Shizhe (Kenneth Tsang) tells his two daughters, the careerist Wa'er (Huo Siyan) and teenage Xiaolan (Jiang Mengjie), that he has decided to sell his upscale vegetarian restaurant, the centre of his life for 30 years.

After the bandits murdered his native tribe, young Shankui began to live in the forest on the Tianmu mountain as a savage hermit, who lost his human form. The wild orangutan was Shankui's only friend, until one day a little girl Kong'er came to the woods in search of weapon for revenge. Savage and girl became friends but bandits's boss hired best chivalrous swordswoman to kill The Mountain King.

The film tells the story of Zihao living in a seaside town returning to Hong Kong and living a life by the sea. One day, he met the mysterious girl Xiaoyi and began to take care of Xiaoyi's life. The ocean boat where Zihao's father was, the fishing boat returned, but the crew were all missing. Zihao, who experienced the pain of losing his father, walked out of the haze under the care of Xiaoyi, and the two were together. But the good times didn't last long. A mysterious middle-aged man named Lao Jin came to Hong Kong and revealed Xiaoyi's true identity

The story is based on the 57th episode of Journey to the West - "The Real Sun Wukong", in which Sun Wukong is trapped in a mysterious cave by the Yellow Eyebrows Monster. With the help of his best warrior, the King Bull Demon, he sets up a field of life and death for the little demons to fight for their lives, and when they die, he takes their spiritual power and pours it into the mud to create the Six Eared Macaque Monkey, which tries to replace the real Monkey King. The monkeys disguised as monkeys in Mount Huaguo and spent their days with Sun Wukong. He is accustomed to fighting alone and is forced to join forces with other demons to save himself, but he gradually realizes the true meaning of the word "Great Sage". In the end, Sun Wukong is reborn from his stone heart and escapes from the cave in a duel with the Yellow Eyebrow Monster.