How to return the gift

First, if you really want to become good friends with him and feel that you have the opportunity to repay this favor in other ways in the future, then accept your thanks. You can say thank you and invite you to dinner later.

Second, but in the case that two people are not familiar with each other, as far as my suggestion is concerned, I still don't accept it. I just took it humorously and said, "Oh, that's great, thank you, but I won't accept it first. Just seeing your intentions makes me happy. Haha. " If he insists on your acceptance, you should explain your principles and habits clearly and say, "I know you want to make me happy, but of course you can understand." People you don't know very well, don't get involved too much. They must be clear about their attitude in time, gentle and firm. I think this can avoid unnecessary trouble.