Outside the ruins.
Jin San was the guard captain on duty here. He led a bunch of members from Jin and Hua families which were responsible for the logistics of the espers, and also to stop outsiders from entering the ruins.The agenda of those big shots, he roughly knew a bit. Hence every time a deal was complete, he would receive a huge sum of money, and naturally he would spend a portion of it.
Since large sums of money was easily obtained, why must he be against it?
What he needed to do was to completely seal every possible information leak. This included, killing reporters that rushed over here after they obtained information from who knows where to prevent any information leaks. Just now, a reckless reporter, actually threatened him to expose this to public, wasn’t that courting his death?
He easily killed that fella.