I'm not sure which novel you're referring to. However, I can tell you some common plots in ancient novels. If you're referring to a short story from many years ago where the female protagonist sacrificed herself to the male protagonist who lost his memory after being poisoned and regained his memory, then this kind of plot is more common. It might be some plot in " How Many Flowers Have Fallen in My Dream " or " Dream of the Red Chamber ". " How Many Flowers Have Fallen in My Dream " was a famous story about the heroine, Lin Daier, who sacrificed her life to save her lover, Yang Kang. However, in the end, Yang Kang was poisoned and lost his memory, and Lin Daier also lost her memory and identity. Later, after Yang Kang recovered, he found the story of Lin Dai 'er and her getting back together. There was a similar plot in 'Dream of the Red Chamber', which described how Jia Baoyu lost his memory for some reason, and after a series of events, Jia Baoyu finally recovered his memory and was back with Lin Daiyu. If you have a specific name or plot request, I can continue to provide you with help.