There are a few novels that fit this plot. I'll introduce you to two of them: "A Fickle Prince Meets a Cold Concubine" and "The Female Supporting Actor Retreats, Male Lead Please Go Away." These two were ancient romance novels. In the plot, there was a male and female protagonist who traveled back in time. The two of them loved each other and killed each other. In the end, they would be able to break through the clouds and be happy together. I hope you like this fairy's recommendation. Muah ~😗