In China, no matter who you deal with, you should first assume they are a bad person and not easily trust them. Under the influence of the system and Confucianism over the years, it is common for people to prey on each other, to make things difficult for each other, and to take advantage of your trust to empty your pockets. Don't believe in the castrated idea that you can rely on friends when you're out and on relatives when you're at home. In society, you can only rely on yourself; no one else will truly understand your situation.