1. According to the Supreme People's Court's Interpretation of Several Issues Concerning the Application of the Marriage Law of the People's Republic of China (III) Article 10, "Husband and wife sign a real estate sales contract before marriage, pay the down payment with personal property, and repay the loan with common property after marriage. If the real estate is registered in the name of the down payment person, the real estate will be handled by both parties at the time of divorce.

If no agreement can be reached in accordance with the provisions of the preceding paragraph, the people's court may decide that the real estate belongs to the party with registered property rights, and the unpaid loan is the personal debt of the party with registered property rights. After marriage, the amount paid by both parties to repay the loan and the corresponding property appreciation part shall be compensated to the other party by one party in accordance with the principle stipulated in the first paragraph of Article 39 of the Marriage Law. The part of repayment after marriage and property appreciation can be regarded as the joint property of husband and wife and can be divided.

You can add your name after marriage, but that is equivalent to your boyfriend giving you part of his property rights, and you become the owner of the house.