Chen San Ye paid the protagonist to buy ferocious beasts from him, while the protagonist helped hunt them. Originally, once the tiger had been handed over, that should have been the end of it. But Chen San Ye had practically used both threats and inducements—wouldn't the protagonist be an idiot to give him another one? And don't forget, the protagonist had a system. What sort of person Chen San Ye was—didn't he have any fucking clue? If the tiger had a better destination, why give it to Chen San Ye?
As for Chen San Ye, the reason he had been able to send his son into Green Mountain City, and even give him a chance to step into the Blood Refining Realm at Fierce Mountain Hall, was almost entirely because he had monopolized all trade between Small River Village and the outside world. He had never been a good man to begin with. The money might be given to the protagonist, but whether the protagonist would be able to spend it was another matter.
Or rather, he had never intended to give that money to the protagonist at all. It was merely meant to tempt the villagers. When he discovered that tempting the villagers was useless and that everyone who entered the mountains died, he could only increase the bait and push the protagonist forward. But even if the protagonist did hunt the fierce tiger and he paid one hundred taels, that one hundred taels, along with everything from before, would inevitably be taken back.
The protagonist simply did not want to concern himself with these matters. He was about to leave, and only wanted to gather enough money or supplies as quickly as possible, leave Small River Village, and enter Green Mountain City.
What did Chen San Ye's messy, rotten bullshit have to do with him? Unless the other man came looking for trouble.