After a Woman Wore a Man's Clothes, I Was Bound to the Teaching System

No CP Accept criticism, please add to the bookshelf, the author is a full-time writer A female history professor who was single until she was 64 traveled through time with Siyan, and she was rejuvenated until she was 18 years old. She was bound to the teaching system (a system that forced her to change her name...). The system changed her gender without her permission, and asked her to be the male protagonist's early gold finger and become the male protagonist's teacher. She directly founded a private school, and both the male and female protagonists and the villain cannon fodder were her students.