There are actually many similar phenomena, countless even. The security workers all know how many gangs are in their jurisdiction, but without sufficient evidence, even if they apprehend someone, they have to release them. Instead of earning kudos, they earn a reputation for abusing power, with no one up or down benefiting.
Scar not only hides his origins well but also has several residences. Even if he's under surveillance, the security workers often can't keep track of him.
However, a person's luck does run out eventually.
...
Yan Fei easily found out Scar's whereabouts; the security workers have to have informants to inquire. But when Boss Yan takes action, it's never required, he just directly asks people.
No one refused to talk, everyone cooperated willingly.
Despite Scar being involved in a small gang, he lives in the city's wealthy district and has several residences.
