The reason she was a teacher in name only was that after Du Anrao flagged her as a person of interest, Xu Ronghai and his team made prior arrangements. They found a pretext to transfer her from her teaching position to a different department, effectively eliminating any possibility of her coming into contact with students.
This served as a reminder to Du Anrao. Having anticipated current events but fearing that alerting the enemy too soon would cause the source of the infection to shift to unknown targets, Xu Ronghai had chosen not to aggressively cut off everyone’s contact with the outside world. Instead, he opted for a relatively subtle approach, steering them into pre-prepared isolation environments without arousing suspicion.
Following the sudden death of the wealthy playboy, those individuals were placed under control almost immediately, completely severing their contact and potential interaction with the outside world.
Chapter 489