Earth has entered an extraordinary era, where all things evolve and demonic beasts run rampant. Humans, in their evolution, awaken star souls to combat the rampaging demonic beasts. Zhou Xuan, who works as a laborer in the Demon Suppressing Tower, accidentally awakens an unscientific check-in system. By checking in on ancient beasts, he gains primordial power; by checking in on weed spirits, his star soul evolves into a nine-leaf sword grass. Millennium black turtles, ten-thousand-year-old sea kings, immortal phoenixes, and sky-swallowing dragons all become his check-in targets. 'Ding, target detected—Heavenly Dao, do you want to check in?' 'Ding, you have successfully checked in on the Heavenly Dao, obtaining the laws of the Heavenly Dao.' Heavenly Dao: Huh?? Am I leaving?? On that day, the demon god awakens, and Zhou Xuan uses grass as a sword, cutting the demon god to complete annihilation. This book is also known as 'I Learn to Cut Gods in the Demon Suppressing Tower'.