Bo Ye got his hands on a dimensional guild-building System, but every guild slot in the System had already been taken. There were guilds for the Invincible, the Protagonists, the Villains, and so on. After looking it over a few times, he finally realized that protagonists, villains, supporting characters, passersby, animals, and monsters had all been claimed.
After thinking about it for several days, he finally found a loophole. If people wouldn't work, and neither would other living things, then he could use the place that appeared most often, a school, as the starting point for building his guild.