Do you still need to pay him back?

No need. It is illegal to raise funds after the collapse of He Xin Pratt & Whitney platform. It is illegal not to return the money in the letter. If you call the CBRC directly, they have no right to call the address book. All kinds of soft violence are related to the underworld. The key is that the contract with the new Pratt & Whitney is not standardized and belongs to contract fraud. Read the contract carefully and learn to protect yourself with the law.