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Zhou Li's senses were very sharp, and during his years at the Imperial Academy, he frequently encountered certain individuals, such as the young master he had roughed up with a sack over his head, or the rich young man he had coerced to the lavatory. These were all the familiar strangers to him.
These people often did not know Zhou Li, as he was very covert in his actions and carried them out decisively without leaving any problems unsolved.
However, there were always a few clever individuals who, through special means, deduced Zhou Li's identity. Of course, it wasn't ruled out that Zhou Li intentionally leaked his identity as bait. Often, these people would find Zhou Li and pretend they didn't know him, all the while waiting for an opportunity.