Was there an ancient novel where the male protagonist didn't like the female protagonist at first, but later became cold because the female protagonist was injured, and the male protagonist deeply regretted it? It could be a transmigration theme.

Yes, I recommend "I've Transmigrated and Became the Female Lead" to you. The female protagonist, Bai Xingchen, was transported to an ancient novel world by the system and began her life as the female protagonist. The male protagonist, Lu Hanchuan, did not like Bai Xingchen at first. However, due to various reasons, Bai Xingchen became cold after being injured. The male protagonist deeply regretted it and began to get closer to Bai Xingchen. This is an ancient romance novel about time travel. The plot is very exciting. I hope you will like it. I hope you like my recommendation, Mwah ~