My Teacher Is a Little Sick

My name is Xu Jinyu, and I am a teacher at Guizhu Sili School; I take the place of a class with problems, and I will definitely be able to teach this group of problem students well and make every student achieve something; I have a secret. There is another me in my body. He is my previous life. He is a martial arts master who can block bullets for others. I don't know if he is crazy or I am crazy. (Ps: The stories in this book are purely fictitious, and any similarities are purely coincidental.)