In the End, Did Zhuangzi Dream the Butterfly?

Three years into her marriage, Nan Yu discovers a devastating truth at the civil affairs bureau: according to the system, she's single—but her husband Shen Yuheng is married to another woman. How can a marriage certificate exist in her hands but not in any database? As reality unravels like a half-remembered dream, she must confront an impossible question: was their entire marriage real, or has she been living in someone else's carefully constructed illusion?