Quick Transmigration: How Could Someone This Cute Be a Villain?

[Updated daily with 4,000+ words. One-on-one romance; every male lead is the same person. Both are completely devoted to each other, and the romance is incredibly sweet. The heroine is a big shot on the outside but timid at heart; the hero is doted on by everyone, a sweet innocent on the surface but dark underneath, with yandere tendencies.] “What do you mean, I stole your adorable little brother?” Everyone thinks she’s a big shot with a 100% mission success rate and countless points. In truth, she earned them all by diligently completing one mission at a time. She was doing just fine with her missions until she met a boy who was outrageously handsome and adorable. She only had a little too much to drink. How did the plot end up going completely off script? But… When the handsome, adorable little crybaby clutched her sleeve and looked up at her pitifully, asking, “Sis, don’t you want me anymore?” She couldn’t bring herself to say no. Her heart melted completely. “How could I ever not want you? I’ll never abandon you.” … While the little crybaby was cuddling up to her, he never once mentioned that his sister was the villainess and he was the main villain!!! “System, how could someone this adorable possibly be the main villain?” The System sobbed. “I don’t want this either, Host! The villain’s and the villainess’s corruption levels are both rising. You’re on your own!” Cang Wei grabbed the little System. “System, don’t go! Don’t leave me behind!”