The female protagonist was a special forces soldier from a mysterious organization, and she returned to the school with a hidden identity?

Answer 1

There were many novels of this type, among which the more famous ones were Battle Through the Heavens and Martial Universe. In these novels, the female protagonist was usually a special forces soldier with strong combat ability. In order to protect herself and the people around her, she chose to hide her identity and return to school. In school, she started her own academic life again and established friendships and relationships with other students. While hiding her identity, the female protagonist was also trying to find her own way out and goal, and finally succeeded.