Where did Ren He go for high school? No.13 Middle School would definitely know because to transfer schools, one first needs a letter of acceptance from Capital Fourth Middle School.
Moreover, at that time, Liu and Xie were obsessed with whether Ren He would come to study at No.13 Middle School. Especially Xie, if nothing went wrong, and if Ren He insisted on attending the high school division at No.13 Middle School, he was bound to be Ren He's homeroom teacher. There was simply no suspense about it; Liu had already hinted as much to him.
In fact, there were no issues when he became Ren He's homeroom teacher, but for others... it just wouldn't do.
