Looking for a manhwa — villainess / transmigration / false heroine I'm trying to find a ...

Looking for a manhwa — villainess / transmigration / false heroine
I'm trying to find a manhwa I read a while ago, but I can't remember the title. It's a full-color Korean manhwa.
Here are the details I remember:
The female protagonist has black hair, and the male lead also has black hair.
The FL transmigrates into a novel/game-like world and becomes the “villainess.”
There is another woman who is considered the original/main heroine. She is extremely obsessed with being the person everyone loves and believes that she is destined to be loved by everyone.
However, there is a true villainess behind the scenes. She was the one searching for souls/people from other dimensions to send into this world so that someone could make the “heroine” pay for ruining her life.
Many people/souls had been brought into the story before our FL, so our protagonist wasn't the first one. They were basically caught in a repeating cycle.
Our FL eventually manages to break this cycle.
There is also a lot of drama involving the ML's family:
The ML has a brother who desperately wants to become the heir.
The brother becomes involved with the “heroine” and conspires with her against the ML.
The heroine is involved with the brother romantically, but she also wants the ML because she genuinely believes that everyone is supposed to fall in love with her.
The ML's father discovers what the brother did and sends him to war, hoping that he will mature and learn what it means to be a proper heir.
Later, the brother disappears into another dimension/world while following the heroine.
There is a scene where the FL and her family are put on trial. Her family is actually guilty and is sentenced, but the FL herself is saved at the last moment by the ML's family. Her family is not rescued — only she is.
The FL also becomes very close friends with a princess who has short gray hair.
Near the end, the ML's parents realize how badly they treated the FL and apologize to her.
There is also an important scene where the ML's mother interrogates the “heroine.” During the interrogation, she realizes that the girl has actually been extremely disturbed/manipulative since she was a child and had simply been pretending to be innocent. The mother had genuinely believed she loved/protected the girl, so she feels guilty when she finally understands what she was really like.
I also vaguely remember that, toward the end, the “heroine” is forced to experience/see the suffering she caused in some kind of virtual dimension/simulation, or something similar.
I know this is a lot of oddly specific details but I really hope someone recognizes it. I think the title had something to do with “Villainess,” but I'm not sure.