My Whole Family Forced Me to Pretend to Be Terminally Ill, but I Turned Out to Be Really Sick.

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.