someone with username Tess W explained it in a few comments below, apparently that was just a rumor.
I'm actually curious and googled it then found this website, explaining that the marriage certificate was photoshop. Take a look and judge it yourself since none of us really know the truth.
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https://onehallyu.com/topic/744517-concrete-proof-that-huang-jingyus-marriage-certificate-is-completely-fake-the-story-of-him-abusing-his-nonexistent-wife-falls-apart-please-read/