I Spent the Last Three Days of My Life After Being Diagnosed with Cancer.

The Female Protagonist Misunderstood the Male Protagonist, and After Killing the Male Protagonist, She Learned the Truth and Regretted It, Asking for Forgiveness.

I want to watch something similar to "Male Supporting Actor: After I left, the heroine regretted it beyond measure!" Book.

Is there any Genshin Impact or Honkai Impact novel that everyone hates at the beginning and then the protagonist disappears or dies and everyone regrets it?