Those Who Pass Through Are Not Allowed to Enter

Travelers please do not enter, because I have discovered you! When Gu Bei received the invitation to travel through time, he did not choose yes or no. He was a student in the computer department and he knew what he was going through now. Unplug the network cable, shut down the computer, and reinstall the system! But faced with the terrifying prophecies of a roommate who traveled back from the future. A demon cultivator who failed to overcome the tribulation in the world of cultivation. An unscrupulous otaku with a systematic counterattack. What should Gu Bei do? Go back! You bunch of cheaters! ! ! !