There were many urban immortal cultivation novels with security guards as the main characters. The more classic ones included Mortal Cultivation Biography, Battle Through the Heavens, Douluo Continent, and so on. These novels all told the story of the protagonist cultivating to become an immortal in the city. There were both the growth process of mortals and the fantasy adventures of the Xianxia world. It was a story in which the protagonist faced various challenges and difficulties in the process of cultivation, constantly tempering his will and strength, and finally became a powerful immortal cultivator to save the world.