The Beidou Division is a mysterious organization under the Imperial City Division in the Northern Song Dynasty, and its members are all codenamed by the Beidou Stars, each with different abilities, and has mastered the magic and advanced technology at the time. Tai Sui, a reckless boy with an "immortal body", accidentally got acquainted with the violent Lori Wu Yaoguang with special abilities and the wind wanderer Liu Suifeng, and followed them to join the Beidou Division. After that, they repeatedly solved strange cases, punished evil and promoted good. Through a series of cases, Tai Sui gradually discovered that his "immortal body" was related to his confusing life experience, and there was a greater conspiracy behind these cases. He does not want to be in the same league as the evil forces, and uses loyalty, friendship and wisdom to unite his partners and continue to grow. In the end, with the help of the righteous people, they finally found and punished the culprit, supported justice, and benefited the people.