Legal analysis: as long as you don't cheat money, the law won't care, just moral condemnation. If you get married or cheat in the name of marriage, you commit bigamy or fraud, which is against the law.

Legal basis: Article 258 of the Criminal Law of People's Republic of China (PRC) stipulates that a person who has a spouse commits bigamy or marries another person knowing that he has a spouse shall be sentenced to fixed-term imprisonment of not more than two years or criminal detention.