After Swearing a Hundred Days, I Was Trapped in an Abandoned Teaching Building

[Help! There are still 100 days before the college entrance examination, what should I do if I am trapped in a strange and long-abandoned teaching building] "Welcome to the abandoned teaching building system" "We look for marginalized people in campus life, attract you here, and keep you in the time and space you want to stay in most, to participate in a thrilling game that you will never experience in reality." "But... This is not the time and space I want to stay in at all!" He Yingli just sneaked away for a while during the 100-day swearing-in ceremony. He Yingli didn't understand how she broke into this abandoned teaching building. The teachers and students of the school suddenly disappeared, the misplaced space they accidentally entered, and those strange but familiar... Friends? In order to live up to the twelve years of hard study, He Yingli made up his mind to go back within a hundred days: "It's just a mystery game, let's see my genius detective pass it in one life!" There are ninety-nine doors in the abandoned teaching building. Behind each door lies an unexplored secret. In the journey to find the correct exit, the puzzles to be solved are not only the long-lost past, but also He Yingli's heart that has gradually become numb in the past three years of high school... "The game begins" "Open every door you come across!"