After Becoming the Villainess, I Reached a Happy Ending with the Yandere Villain

1: Su Li transmigrates into a book, becoming the same-named wicked female side character in a sweet romance about a powerful, wealthy family. In the original story, the female side character uses an arranged marriage to get close to the male lead, marrying Mu Yang, his comatose, vegetative younger brother. Taking advantage of being close to the male lead, Su Li constantly tries to seduce him and bullies the heroine. One day, while she is tormenting the heroine, who has come to visit Mu Yang in the hospital, the man lying in bed wakes up and pushes Su Li out the window, killing her on the spot. When Su Li transmigrates into the book, she arrives just as the original is about to slap the heroine, her hand already swinging. Quick-thinking, Su Li raises her left hand to block it, making her own palms smack together. Under the heroine's astonished gaze, Su Ruan's eyes fill with tears from the pain. She claps as she turns to look at Mu Yang lying in the hospital bed. "That's wonderful, honey. You're finally awake." 2: I like your brother. You like your sister-in-law. So that's the real reason I married you: so we could get close to them. The man in the wheelchair watches her with his arms folded, looking perfectly at ease. "And then?" Su Li draws a diagonal line through the names of all four people on a sheet of paper. Then, of course... We break them up! Her first challenge after the villain wakes up: how to explain to the clearheaded villain why she schemed to marry him. Looking at the powerful villain with his fake smile, Su Li can only think: This is so hard. 3: To stay alive, Su Li tries every day to help the villain come up with ways to win over the heroine. Su Li: Boss, your brother is having dinner with the heroine at X Restaurant today. Mu Yang: ...Mm. Su Li: Boss, the heroine is going out shopping by herself today. It's a great chance for you to make a move. Mu Yang: ...Oh. Su Li: Boss, as far as I know, your brother is going on a business trip tonight. This is the perfect time to make your move! Mu Yang finally loses his patience and pins Su Li against the corner of the bed. "You know I love you, yet you keep pushing me away every day. Do you even have a heart?" Su Li: ??? Wasn't the lovesick villain only supposed to love the heroine? Blurb screenshot dated June 2, 2020.