I’m not the Leader of the Demonic Cult, I’m the Baby Leader

The leader of the Demonic Cult, the greatest villainess, Heukcheon Biyeon, has entered the world of romance novels. She is now the adopted daughter of Duke Bathius, known as the descendant of the devil. There are seven tests to become the official successor of the Duke’s family. If she defeats her competitors and becomes the successor, she will inherit the Duke’s secret techniques. “I’ll be the successor.” Biyeon passes the tests using internal energy and martial arts that do not exist in this world. She aims to become the Duke’s successor and achieve the realm of life and death that she could not attain in her previous life. *** But why are the Duke’s family members, who were once eager...