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The famous screenwriter and writer Song Fangjin is a masterpiece of Zhiguai novels. Once a promise is made, there will be no hindrance in a thousand mountains; once a promise is made, there will be no hindrance for thousands of years. A lasting promise that transcends reincarnation, a colorful Jinling scroll. On the fifteenth day of the first lunar month of a certain year in the Ming Dynasty, on the night of Lantern Festival lanterns, a strange thing happened in Nanjing Confucius Temple. Men, women and children all over the city were betting on whether Meng Junlang could go to his appointment with Zhang Yuanbo on time. A poor scholar who is gentle and honest but fails many times, and a playboy who is lively, out-of-the-box and quirky. A "Shangyuan Appointment" between the two attracted the attention and eagerness of the entire Jinling City. A lasting promise that transcends reincarnation, a colorful story. For a promise, we can cross the boundaries between life and death, humans and ghosts, and even cross the barriers of time and space. Once a promise is made, there will be no hindrance in a thousand mountains; once a promise is made, there will be no hindrance for thousands of years.

Cheng Tie, a young teacher who likes to use mathematical knowledge to solve all problems in real life, has a girlfriend who studies psychology. Chengtie believes that the world and everything in the world is a mathematical formula, and precise calculations will produce accurate results; Tick believes that the world is uncertain, especially people. The story begins when Cheng Tie's younger brother Cheng Qiang suddenly disappears. Cheng Tie and Tik Tak track him to a deserted island. On the deserted island, all outside contact is cut off. The desert island is controlled by a criminal group. The various monitoring facilities on the island overwhelmed Chengtie. At this time, Chengtie, Tick and others used Chengtie's mathematical knowledge, Tick's grasp of human psychology, and the perseverance, love and courage inspired by life to decide to escape from the deserted island.