A person wouldn't suddenly undergo huge changes, especially someone like Nangong Fu who was an ordinary individual. He wasn't a special agent, and without specialized training, his demeanor couldn't possibly change so dramatically all of a sudden.
Moreover, whether it was his tone of voice or certain gestures, Nangong Fu's actions seemed as though he had undergone specialized training. While an average person might not notice anything amiss, through Ning Fan's eyes, there were significant problems.
When something is abnormal, there must be something wrong. Ning Fan suddenly thought of something, scrutinizing Nangong Fu's build, and squinting his eyes. His observational skills were so acute that he immediately broke out in a cold sweat.
The frank and generous demeanor that Nangong Fu was displaying might please Xu Ruolan, but for Ning Fan, it was like a knife pressed against his neck that he hadn't detected immediately.
