The Villainess Who Transmigrated into a Book: Everyone but Me Is Evil

[Transmigrate into a book + face-slapping comeback + powerful alliance + mutual salvation + character reversals + imperial court and nobility + household intrigue + martial arts world]

Jiang Hanyan transmigrates into a novel as the wicked villainess. She wants to turn over a new leaf, but is forced to follow the brainless plot.

As she goes along, she realizes something seems off about the original protagonists' characterizations.

The heroine acts kind and gentle, then turns around and chops someone's head off!

The hero seems mild-mannered and courteous, but is actually a murderous lunatic!

The supporting male lead appears disciplined and proper, but the next day he can lock someone up in a dark room!

Jiang Hanyan is stunned. What in the world? The whole cast has turned into deranged villains with completely reversed personalities!

So everyone's only pretending to be kind, and she, the wicked villainess, is the only genuinely good person?