In the novel, Lilia Horace is the villainess. Originally, finding out she had a half-sister, she threw a fit and was unable to accept it. It was made worse when sometime after the news broke out, her weak and good-hearted mother was unable to bear the pain of betrayal so she committed suicide. Losing her only ally in the world, Lilia grew to blame the death of her mother to Alice.
Her father, guilty of what happened to her mother increasingly spoiled her and this tilted the balance of how the servants treated their young misses, with Lilia being favored more than Alice. That is why Lilia grew up as a spoilt and a hard-headed child, while Alice grew up having a better character. After all, before Count Horace took in Alice, the nameless maid already taught her good manners.
Following the plotline, Lilia would continually bully Alice. Around five years later, Alice ran away crying as Lilia did what she usually does. She would run into the crown prince, Charles Gwindel. Several encounters between them would happen with Charles and Alice growing closer and closer to each other.
The king had long considered the count as his friend and has decided that his son's fiancé shall be his best friend's daughter. When the king has consulted of this decision to Charles, he saw how his son's face broke up into a smile and so the engagement was decided smoothly with all party agreeing.
That was until Charles found out that the daughter that was being talked about was not Alice but Lilia. Charles knew from his meeting with Alice that she was the count's daughter but what he did not know was that she was not the count's only daughter. This was a well-guarded secret in the count's household, which was why the outside only knew of the count having only one daughter.
From their first meeting, Charles had no good impression of Lilia as connecting two and two together; he knew that the person who always made Alice cry was Lilia. Lilia meanwhile was lovestruck at first sight with her meeting with the crown prince maybe because of his looks maybe not, but for sure, she was struck hard. As the story progressed Lilia would become aware of Charles and Alice's affection for each other. Swallowed by envy and hatred, her bullying became more creative and more harmful to sweet Alice until Alice's life was put in danger.
Fortunately, the crown prince was there to save the day. Charles impression of Lilia was already in the negative but it really plummeted down to the infinite lower stratum as he witnessed how she almost killed Alice. Charles was not the only witness to the incident; there was the king, the queen, and other servants. Count Horace, in his shame and pressure from all the witnesses, illegitimized Lilia while in turn legitimizing Alice.
In Count Horace words, "I am ashamed of how you have become, Lilia. Doing that to Alice... I have judged that you have become unworthy of the Horace's name, you shall be a commoner from now on. Meanwhile, Alice has shown exemplary behavior, I shall adopt her and she shall be Alice Horace."
With that announcement, Alice had the social standing to be with Charles and they live happily ever after. Meanwhile, Lilia not knowing what else to do being reduced to a commoner and all, followed in her mother's steps. The end.
Yes, that's the unfortunate ending of the original Lilia and may as well be hers if she doesn't do anything about it. She hasn't really thought much about the moves she will make these past five years as the idea of Alice and being reborn in a novel seemed really ridiculous to her but being nearer to the timeline of meeting Alice made her a little on edge.
Thinking about it… If Alice and Charles didn't meet each other, they wouldn't have the time to grow their affection in the first place. That means she just has to prevent Alice from running off due to the original Lilia's bullying. This also meant that she should just not bully the heroine. That was what was going on in Lilia's mind as she continued eating.