I'll be Knowhere as silent, father.

Sirene Flastansia Sionia was a loved villain however the protagonist appeared in her life and ruined everything for her, but still. She accepted it and didn't make a move, but suddey the protagonist crossed the line. Seria Flastansia Sionia, the sweet cunning bitch. The protagonist, she seduce the Main lead who was Hiro Hiroshima, the one that Sirene yearned for. Sirene's fiancee, Hiro was deprived in Seria's beauty and intelligence, so he decided to leave Sirene.

However, the antagonist, Sirene. Couldn't bear it any longer and almost killed Seria, she survived because the leading man saved her. Also, in that night. He killed Sirene and live happily ever after.

But. Sirene was isekai'd by someone who's tired of her life and continuesly to fight fate.