Cultivators were the most practical people. As long as there were benefits, enemies could become friends. It was clear that Zhao Hai had the ability to protect the fan family and could even provide them with a very relaxed environment. In addition, Zhao Hai had promised to give them one-tenth of the items in the family's Treasury. This was very attractive to the fan family.
From an outsider's point of view, Zhao Hai had stolen something from the fan family and returned it to them. He was clearly taking advantage of them, and the fan family must have harbored a grudge against him.