Xiang Kun had a chat with Yang Jie's younger brother, Yang Zhuo, and discovered that this young man, who had just started his first year of university, actually admired him quite a bit.
This kind of admiration, as sensed and judged by Xiang Kun, couldn't be faked.
Furthermore, he had found a portion of the video that bystanders had taken of Xiang Kun when he accidentally encountered and apprehended a wanted criminal in the street - it didn't capture him taking down the criminal, but it did capture him sitting in a police car.
With Zhang Qian's help, he guessed, Yang Zhuo should have researched pretty much all the public information about him.