I Became the Younger Sister of a Regretful Obsessive Male Lead

I’ve transmigrated into the world of the BL webtoon where I left my one and only spiteful comment. On top of that, I became the adopted younger sister of my favorite character: the obsessive male lead who is later regretful for his actions, but still dies along with the duke in the end. So, I became determined. Since I transmigrated into this world, I can’t just stand by and watch my favorite character die. Additionally, I also don’t want to die. That’s why, author, I’ll need to change the tags and the ending of this webtoon slightly! From to tragedy to happy ending. “Brother, please smile like that in front of others as well.” I said to Lucian, who doesn’t smile even a little bit in fro...