I'm not sure which novel you're referring to because you didn't provide the title or plot of the novel. However, according to the plot of some novels that I know, you might be referring to novels like " A Thought of Eternity " or " A Full-time Expert ". In these novels, the male protagonist had forgotten the female protagonist's name and had been reborn. If you have specific preferences, you can tell me and I can provide you with more detailed information.