I owe interest money, can I not pay it back?

At least, be honest! If you think honesty is not worth 70 yuan, then you don't have to pay it, and you will face three consequences: (1) If Yi Bei doesn't sue you, will your conscience be reprimanded? (2) Is Yi Bei worth telling you? Unlikely as it is, won't Yi Bei kill one policeman and a hundred policemen? (3) There is another situation. Although Yi Bei didn't sue you, he has mastered your information, and you have become a blacklist in Yi Bei. Don't think it is a trivial matter. Let me give you an example: in the United States, dishonesty is recorded, which will affect employment, loans and immigration. Then you would say, I'm in China. Yes, there is no credit file in China at present, but it will be established soon. You can't say for certain that one day in the near future, Yi Bei will hand over your information to the organization responsible for the integrity file, and then you will be in trouble. This will be a lifetime thing. Summary: Why ruin your reputation for tens of dollars? Look before you leap.