Killing Him with a Knife Is Reasonable

I inadvertently broke into the magical world, thinking that I would conquer demons and demons, earn a reputation for justice, and make a lot of money. Who would have thought that the most powerful newcomer would become a popular mission cheat, but he didn't have enough credits? Looking for a junior, but the workload is not up to standard? Looking for a junior... In the principal's office, Gu Cheng said listlessly: "I have enough credits, I want to graduate early." The vice-principal glanced at the tasks he had not completed this year: "Write a graduation thesis about slaying a dragon!" PS: This book is also known as "I am a mission tool", "Everyone on the other side of the door will die", "Counter Invasion of Another World"...