I will become the Demon Immortal known to the whole world - Chapter 207 - 205 Come Everyone, See What is Called the Path to Ruin

This is a world where humans, demons and mysterious beasts coexist.

Humans cultivate mysterious qi. Demons cultivate corporeal bodies. Mysterious beasts cultivate soul perception.

A legend says that in the middle of an endless rainforest, there are extremely powerful existences; they are called demon kings.

Some demon kings have a tyrannical corporeal body, some are experts in illusions.
Some demon kings are proficient in magic, some can even move mountains.
Some demon kings are able to sense things thousands of miles away.

These demon kings rarely appear in the human world. Even if they emerge in the human world, they would reincarnate in human form; assimilating with mankind while seeking to breakthrough realms…

- Description from Novelupdates

Susu, a hard-working woman, accidentally finds herself in a novel set in the 1980s, stepping into the shoes of an unlikeable female lead who was resented by everyone in the family compound for causing endless trouble. She became Su Er Ya, the demon sister who threatens her husband to divorce if he dares to adopt the orphan of a comrade-in-arms. With such an unfavorable start, watch how she turns the tide. From selling braised goods to opening a restaurant, her career thrives, and in turn she becomes beloved and known for her magnanimous personality. Lu Xiaoting, a stern public security officer, realizes that the once lazy and gluttonous woman who took advantage of others has changed.Lu Xiaoting, embracing his wife: “Wife, don't be mad, I was wrong!”Susu, looking at the man with broad shoulders and a commanding presence reminiscent of a modern-day celebrity, smiles sweetly. She triumphs by mastering the culinary arts.Witnessing the transformation, their son Xiaoyu leads the three little 'turnip heads', Su's adorable children, who pout and complain about their father taking their mother away yet again.Whining, “Hate it, Daddy took Mommy away again!”“Ugh, Daddy really...!”“Big brother, we want Mommy.”The young boy comforts the three younger siblings gently: “Be good, Dad and Mom will be back soon.”

Soul Piercing Konoha, born as a civilian, will go to the battlefield of the Third Ninja World War tomorrow.

Just graduated from “Ninja School”, Yangtai, who only knows three body techniques and a D-level hemostasis technique, looked at the full of energy, and finally made up his mind – “The battlefield is too dangerous, I’d better go to other worlds to hide. !”

- Description from novelbuddy

It was only after Su Yayan's death that she realized that she was a malicious cannon fodder female character who became a scapegoat in a Mary Sue story.