I'll kill the hero

One day, the protagonist, Kwon Jin-ha, an ordinary person in their 20s, becomes the unfortunate female lead, Elbi, in a romance fantasy novel they used to enjoy. The original storyline involves the female lead enduring hardships from the bad male lead but eventually achieving a happy ending. As it stands, Jin-ha is fated to suffer instead, perhaps even to the point of death.

Then, as if in a game, a system window appears and offers a quest to bring a perfect death to the bad male lead, who torments the female lead. If she succeeds in doing so, Jin-ha can escape from this world.

To create a fitting death for the bad male lead, Jin-ha (as Elbi) collaborates with the male lead and arch-rival, the sub-male lead Luke, as they plan for both romance and revenge.

During this time, Jin-ha (=Elbi) surprises everyone by appearing as a mysterious and charming lady with unparalleled allure in the social circle. She presents the bad male lead, whom she previously regarded as insignificant, with a refreshing feeling, dressed in a different style (DOUCAN design) compared to the characters in their traditional Western period dresses, making her the most eye-catching presence in the social setting of the story.

While envying the jealousy of the rival villainess, Jin-ha forms connections with the queen and nobility and gradually begins her revenge on the bad male lead by presenting him with a refreshing feeling step by step, as she becomes a true noblewoman.