Hello, as you said, in mortgage to buy a house before marriage, even if one party repays the money separately after marriage, the part of the repayment after marriage belongs to the joint property of husband and wife, which needs to be divided according to law when divorcing. But according to your description, the house was bought by the woman's parents with a loan and should also be registered in the name of the woman's parents. Therefore, as long as the woman's parents do not explicitly express the gift, the ownership of the house still belongs to the woman's parents. In addition, if the man advocates splitting the repayment part after marriage at the time of divorce, it is also necessary to prove that the woman did help her parents repay after marriage, otherwise the court will not support it. Of course, it is safer for both men and women to sign an agreement, stipulating that both men and women will voluntarily help the woman's parents repay the loan. In case of divorce, the man will claim that the repayment part is not regarded as the joint property of husband and wife.