How to legally prevent boyfriends from transferring money back?

Holiday and birthday transfers are mostly gifts, and the amount will not be very large. You can't return it, and the law doesn't support it.

You can write a written gift agreement, which clearly stipulates that it is not a loan or an engagement property.

The donor may revoke the gift before the right to donate the property is transferred.

A notarized gift contract or a gift contract with public welfare nature and moral obligation such as disaster relief, poverty alleviation and disability assistance and irrevocable according to law is not applicable.

According to Article 657 of the Civil Law of People's Republic of China (PRC), a gift contract is a contract in which the donor gives his property to the donee free of charge and the donee accepts the gift.