My Cousin Doesn't Want Me Anymore

(Unrelated by blood + both virgins + slice of life + a husband chasing his wife to the crematorium) Ever since Xu Qingyu dreamed of the future, she stopped seeking out Xie Linqi. She thought that because she was the wife of a powerful minister, she would be caught up in the troubles of Xie Linqi, who would later become prime minister, and that was why she died young in her dream.

But it turned out that wasn't the case. It was actually her true identity that caused her to die in the prime of her youth.