Isn't This a Time Travel?

A social worker worked overtime and stayed up all night, and when he woke up, he was back in high school? His cousin still has to live in his house. Fortunately, he has his best friend in his boring high school life. But why is everyone so curious about my brother? What secret does he have! Bullying by classmates, stalking by mysterious people, and even third-party forces? Such a small school can be so lively! ? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.