Gatekeeper of Peace and Troubled Times

It happened to be time traveled to troubled times. I just want to keep a door open in troubled times. It is said that for every person who enters the door, one point will be added. With tens of thousands of points, you can instantly kill the peerless master. Why did I owe the system 80,000 points after guarding the door for seven years? If only this world were as simple as opening and closing doors.