What are the recommended novels about the male protagonist being tsundere and the childhood sweethearts who are younger than the female protagonist?

I recommend the following two novels to you. The first one is "I Have a Sword Immortal Wife." The male protagonist is tsundere and younger than the female protagonist. It's a slow and interesting novel. It's very comfortable to read. The second book was "Reborn Wanting." It was also a slow-moving novel in which the male protagonist was tsundere and younger than the female protagonist. The plot was very touching. I hope you like this fairy's recommendation. Muah ~😘