I Became the Younger Sister of a Regretful Obsessive Male Lead

I Became The Younger Sister of A Regretful Obsessive Male Lead The next moment I open my eyes, I have been transferred to the world of the BL webtoon that I am reading. Inside this world, I was transmigrated to the body of the obsessive male lead's younger sister. This male lead is my favourite character of all the webtoon, and I know that in the end, he will eventually die along with the duke. Since I'm here, I decide to go against the original plot and to save my favourite character from his destiny. Moreover, I also don't want to die at all! Therefore, I am determined to help him. but has something gone wrong here? I know something has definitely gone wrong the moment I heard Lucian calm reply with an expression full of expectation. “Give yourself to me, Rachel.” 후회광공의 여동생이 되었다 / I Became the Younger Sister of a Regretful Obsessive Seme / I Became the Younger Sister of a Regretful Obsessive Seme Male Lead / Reforming the Obsessive Male Lead