After Becoming the Villainess’s Stand-In, the Abstinent Big Shot Falls Hard for Her

[System, devoted couple, male lead goes from indifferent to head over heels] After dying in an accidental explosion, Li Wei was reborn as Lu Hanjin's mistress and stand-in, and got stuck with a ridiculously useless System. The System claimed that if Li Wei completed 25 missions, it would send her back to her original world. The very first second after she woke up, the System issued her first mission: cheat on Lu Hanjin. Li Wei's heart pounded. System, are you serious? Lu Hanjin had just warned her that if she eloped with someone else again, he'd break her legs. System: [Don't you want to go back to your original world? Don't you want to keep being your badass secret agent? Don't you want to stay here for the rest of your life?] Li Wei: “Fine, fine! I'll go cheat on him right now!” - Li Wei had only wanted to quietly finish her missions as quickly as possible and get back to her original world. But lately, she'd noticed that Lu Hanjin was looking at her strangely more and more often. When Li Wei's hair was wet, Lu Hanjin beckoned her over. “Come here. I'll dry it for you.” When Li Wei got sick and feverish, Lu Hanjin held her hand and said, “Don't die.” When Li Wei went to bed on a sweltering summer night, Lu Hanjin insisted on squeezing in beside her. “I'm cold. Want to sleep together?” Even when Li Wei went to work, Lu Hanjin wouldn't leave her alone. “If there's anything you don't understand, I can teach you.” Li Wei thought Lu Hanjin might be sick, so she quietly made him an appointment with a neurologist...