The Idiot's Life in Another World

Su Zhe was originally an otaku who ate and waited for death in the main world. Later, due to a time-travel routine that no one could explain, only novels can explain it. However, the author describes Su Zhe's process of fighting monsters and upgrading in the spirit of making it up. In short, Su Zhe has a system. What is this system used for? Sometimes it is a decoration, sometimes it is the protagonist's personal secretary. Please see the text of the novel for details.