A Class's Collective Time Travel

A boss named Gu from Class 1 woke up and found that she had become the queen of a country that did not exist in history, and she also had a mobile phone with only a WeChat group. Boss: There is no emotion in my heart, and I even want to laugh a little bit. But who is this person who claims to be the same person as her? What? ! You want me to save the world? ! Kill those who travel through time, travel through books, and are reborn? Afraid that I would be difficult to deal with alone, you brought everyone in the class here? Will it take a lifetime to go back? Being a bodyguard for the heroine Mary Sue? Thank you~ Ever since, the boss took the class members to start their colorful journey through time...