How To Be A Dark HeroS Daughter

The MC transmigrated into a novel and became an extra from the novel The novel is a murder thriller and the main character is a serial killer He kills criminals with black magic making him a dark hero think of him as Dexter or batman with dark magic
She MC doesnt have any death flags since shes a background extra but she was a homeless girl of all things in such a dangerous novel
Somehow our MC saves the male lead and to thank her he adopts her
Become my daughter
The richest most powerful and handsome duke commands her to be his child
The MC is freaked out since she knows hes a cold blooded killer Can she survive such a maniac
Yet he dotes on her and constantly says my daughter is the cutest He wants to get master artists to draw her and gather poets to describe her adorableness
The duke alo has a son The apple doesnt fall far from the tree he also dotes on her
In this way a beggar became a little princess She also got used to people getting killed
However there was still one problem
Our MC has turned sixteen and is wondering as a lady will she have an arranged marriage
The whole house atmosphere quickly turns awkward
She realizes perhaps they want her to stay here forever
Can she escape such a strange house Everyone is so attached to her