How Could Something Like This Happen?

"How I wish I could go back to the past and change the things I regretted." Liu Shiyu said melancholy while lying on the bed. Suddenly the moonlight came through the window, becoming more and more dazzling, and Liu Shiyu couldn't open her eyes... When Liu Shiyu opened her eyes again, she found herself in a classroom. Looking around, she felt a familiar feeling. When I went out, I saw the class sign said "Junior Grade 1, Class 4" "This special cat is my junior high school classroom!" "Will time travel really happen to me???" Intention: Work hard to make progress, fantasy is useless