yandere ml manhwa recommendation : I Became The Younger Sister of A Regretful Obsessive Male Lead

I moved to the BL webtoon world where I left my only nasty comment. Plus, I get to be the adopted younger sister of my favorite character: the obsessive male lead who later regrets his actions but dies with the duke. So I decided. Since I moved to this world, I can't watch my favorite character die. Besides, I don't want to die. So, author, I need to change the tags of this weblog and kind of wrap up! From -. From -. "Brother, smile the same way in front of others." I said to Luciano, who doesn't even smile in front of the others. "..."
Was this request too obvious? Lucian looked at me with a strange expression. "If you do, I will give you a gift."
I said this because I wanted to help him as much as possible. He looked at me for a moment and hesitated before answering, "A present...Anything good?"
"Of course!"
When I gave that firm answer, his expression immediately changed to that of a hungry predator... Was I wrong? Lucian then calmly replied with an expectant look. "Give yourself to me, Rachel."
Ah! What did he say? What did he just ask?
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