Now, Yang Yi was inside the CIA headquarters building. After leaving Porter's office with Walter, they passed through two security checks, descended four floors, went through two corridors and a large hall, and arrived at the office area of the security department.
Along the way, Yang Yi had encountered a few people, but no one showed any curiosity towards him. In this busy place, a new face did not attract attention.
It was not until Yang Yi was taken into an office, a front and back suite, that Walter called three people, not to monitor Yang Yi, but to protect him.
If Yang Yi's investigation subject was Aaron, then he naturally needed protection. Although the possibility of an attack at the CIA headquarters was incredibly slim, the same saying applied—if anyone Yang Yi met after revealing his identity and mission did not take his security seriously, then that person was either neglecting their duties or an accomplice of Aaron.