Grandmaster of Heaven is traditional name for immortal villain Tongtian Jiaozhu from Taoist legends. The Tang Dynasty emperor engages a famous detective, when he hears a political rumor about a plot to stage a coup and replace the sitting empress.

During the Wu and Zhou Dynasties two young girls from from different classes - Zhao Qingqing, the daughter of the captain of the Jingwu Guard, and Xiao Li, a girl from the lower class of the city - were accidentally involved in an unsolved case

The ancient people created the five secret arts based on the principle of the five elements, which are the five arts of gold, wood, water, fire and earth, and formed five corresponding sects. However, with the decline of the Golden Gate, the whereabouts of this secret treasure are not known. The Golden Gate heir, Yang Lao, with his son, Yang Yiqin, lives in anonymity in Taoyuan Town, playing iron and selling vegetables.

The film is adapted from the novel of the same name written by Yan Zhiyang. It tells the story of Shen Tuo (Liu Lincheng), a descendant of Mohist's official technique, who enters the Promise Prison alone in order to rescue his beloved wife, Jiang Ren (Liu Jingyi).

Shi Tou and Xiao Lan travel to Sanya for a martial arts audition. While on set, an unexpected incident leads to a misunderstanding with Peter, resulting in Shi Tou and Xiao Lan being forced off the project. They take on odd jobs to get by but soon find themselves drawn back into the unfolding events. As new opportunities arise, film production eventually resumes in their village, with Shi Tou taking on a more significant role.