100th Break: Rules 

Ke Lin and Meng Xing are both tourists. But, Meng Xing brought only two of his 'guards' with him – with one even just 'hired' today, and has no doctor even though he is ill. So, it is better for Meng Xing to hire him as his doctor, since now they are both acquainted. This is better than hiring a doctor from the Closed City since the citizens here are hostile to outsiders. It is better for Meng Xing to buy the raw materials – the herbs and brew the medicine, than the finished medicine itself. 

For these people who hates the outsiders yet still lets them in, there is a possibility that they can harm them. And this is why he offered his services to Meng Xing. As a doctor, it is always right to protect a patient. As he said, it must be fate for the two of them to meet in this such far, as well as suspicious, closed city. 

… 

Somewhere in the Closed City. 

"What?! You said that you saw the future city lord?!" someone exclaimed as he gasped in surprise.