MaryahLu

"Why do the main character's parents often get the short end of the stick?"
That is what Mila asked while looking up at the sky. She was grumbling toward whoever sent her inside the novel she read before she died.
She becomes the mother of the main character, whose parents are both dead. Mila's character was merely a tool for the MC's character development.
It's a simple, fix-all solution. The author wanted to make the audience instantly sympathetic towards the main character, and the best thing he did was to have the MC's parents die.

After she avoided her death in the original plot, death flags kept coming for her. 

Will the original plot not end if she's not dead?

....

proofreader: Aserehtam

Main character's parents must die

"I'm much older!" Luther indignantly exclaimed.

"That's your age as a siren, right? How old were you in human years?" Mila replied.

Luther's face turned red, as if his head was about to explode.

He doesn't know if Mila was just acting clueless just to insist on things the way she wanted. He is somewhat guilty of making Mila think this way about him. There is no other way for Mila to spend time with him if he doesn't have to play with her. He doesn't have a choice but to act adorable for him to have used her before. However, now that the situation is different, he doesn't want to be treated the same way as before.

Luther stomped his feet in frustration as he yelled, "Madam, it's the same!"

With the loud voice and upset expression of Luther, Mila finally gets what is making Luther mad.

Mila apologized awkwardly. "Ah, have I been forcing you to do things? I am sorry for not considering how you feel."

"How come no one noticed?"