Scheming villainess heroine x deranged, obsessive hero + a possessive, coercive romance (they save each other)
Jiang Wanying's motto in life is to get what she wants by any means necessary. Even if she has to act sweet and pitiful, she'll do her best to play the role of Li Nanjue's beloved first love.
So she becomes her older sister, Jiang Wanci.
To her surprise, Li Nanjue, who deeply loves her sister, doesn't notice anything amiss. Instead, he spoils her every chance he gets.
It isn't until her biological father exposes her identity that she is met with a stinging slap before he even gets to question her. Jiang Wanying is struck so hard that blood runs from the corner of her mouth.
Jiang Dingyuan shouts furiously, "How did I end up with a daughter like you? You've been rebellious and disobedient since childhood, and you're vicious too. How could you tie up your sister and imprison her in Jiangbie Pavilion while taking her place? How could you be so wicked?"
But Jiang Wanying smiles. "I wanted to take her place and marry the person she hates most in the world. I wanted to take her place and secure the position of general manager at the Jiang Corporation. I wanted to take her place so all your affection would go to the wrong person. That's just how wicked I am!"
As soon as she finishes speaking, another hard slap lands.
Jiang Dingyuan sees Li Nanjue come in and loudly tells him Jiang Wanying's true identity.
But Li Nanjue tenderly strokes her swollen cheek. "How could I not know who the person I love is?"
Jiang Wanying's eyes widen in shock.
The villainess thinks a demon can only love an angel, but she doesn't realize... demons don't fall for angels. They only fall for villainesses.
Because they... are the same kind of person.