After Perishing Alongside the Demon God

[Transmigrate into a book + 1v1 romance + mildly Lovecraftian + yandere Lovecraftian demon god x laid-back little goddess]

Only after dying alongside the demon god did Shen Luxi learn that she was in a xianxia novel about a broken engagement.

The apocalyptic demon god descends, the male lead ascends to the divine realm and seals the demon god again. She was nothing more than a background character mentioned in passing, there to highlight the demon god's might.

When she woke up again, Shen Luxi had traveled five hundred years into the past and become the fiancée of the male lead who would break off their engagement.

The System told her, "You have to play the villain well to be reborn."

Shen Luxi followed the villain's storyline, delivered the villain's lines, and earnestly played the role of a spoiled, willful senior sister.

But the male lead just sneered. "I'm willing to marry into the Ji Yue Peak household to prove my innocence."

Shen Luxi: ???

Are you serious?

Only at the very end did she realize that this wasn't the original novel's male lead at all.

The demon god, who hadn't quite died, had transmigrated here too...