I'm looking for the title of the novel!

The male protagonist was the female protagonist's university teacher and had a family business. The beginning of the story was that the male protagonist and the female protagonist had been together before, but when they reunited, the male protagonist did not remember the female protagonist. The male protagonist had lost his memory. The male protagonist had a bad heart. The female protagonist was forced to break up with the second female lead to save him and almost died several times. The second female lead had a child with the male protagonist's father and used this child's heart to save the male protagonist. Later, in order to save the female protagonist, the male protagonist even put her in prison. In the end, the male protagonist brought the female protagonist back to her former school and restored the scene at that time. The second male lead's surname was Tang. He married the male lead's sister for the sake of his family.