The transmigrated villain turned the effeminate female protagonist into a yandere.

(The rating has just been released and will increase later.)
[Redemption] + [Growth-oriented Yandere] + [Naive and Sweet Male Lead vs. Tsundere Female Lead] + [Single Female Lead] + [Transmigration]
Qi Nan transmigrated into a female-oriented novel called "Returning to One's Roots in the Capital".
The original owner was a villainous extra in the book. Because he often bullied the female lead Xia Ningqi, he never expected that her true identity was actually a young lady from the capital. In the end, he was skinned alive and thrown to be fed to fish.

Qi Nan didn't want to repeat the mistakes of the original owner, so he began to desperately increase Xia Ningqi's favorability, but he didn't expect to go too far and things started to go wrong.

In order to let Xia Ningqi get together with the male lead according to the plot.
Qi Nan knelt down: "Please, grandma, go and like Ye Fan! He's your true love!"
Unexpectedly, Xia Ningqi grabbed him by the neck, her tone icy, "You think you can just run away after flirting with me? Who gave you that right?"
.....
Original title: If you won't marry me, why flirt? Dare to run away and I'll sever your Achilles tendons.