Bao Jie, since she's brought her relatives this time, must be related to what she talked about with Yan Junze last time.
Something is off with her relative's family, so she asked him to take a look for them. Of course, it wasn't a favor asked without compensation.
When a good classmate asks for help, Yan Junze finds it hard to refuse, but if he realizes the problem is too difficult to manage, he would still look for an excuse to decline.
But now that the condition of payment was added, he had no reason to push it away.
This world is different from the one Yan Junze was reborn from. Although things may have seemed fundamentally the same before the outbreak of the strangenesses, after the outbreak, many things and rules changed.