Lv Zhong was currently unaware that he had been targeted by a super hoodlum. Of course, even if he knew that these hoodlums were watching him, he wouldn't take it seriously.
You need to understand, Lv Zhong had arranged a backup plan in case of retaliation from Can Lang and his subordinates.
More than twenty [Soul Devouring Bugs] were hidden on the bodies and even in the hair of these hoodlums. If Can Lang and his men ever tried to take any action against Lv Zhong, these bugs—monitoring them like super mobile surveillance cameras—would remain completely unnoticed. After all, no one would ever suspect that someone could control these insects to spy on others.
Lv Zhong obviously didn't have a good impression of these hoodlums, but to kill them without good reason didn't sit right with him either. He had no interest in such an endeavour.
Of course, if these guys were truly blind and dared to mess with him again, he wouldn't mind teaching them a lesson they wouldn't forget.