Kidnapped by the System Together with the Villain

Lin Jianwei traveled into the novel he wrote - not the protagonist, not the supporting character, but the cannon fodder who was killed by the villain within three chapters of his appearance. What's even more outrageous is that when she came through, the system popped up a line of text: "Welcome to "Sword Shadow Jianghu". You have been bound to the 'Villain Transformation System'. Mission goal: increase the favorability of the villain Xie Buchen from -100 to 100. Failure penalty: stay in the novel forever and be cannon fodder." Lin Jianwei fell silent. Xie Buchen, the biggest villain in the book, kills people like crazy and is ruthless. In the end, he is stabbed through the heart by the protagonist. Want his favorability to be 100? It's better to just let her die. But she discovered something - Xie Buchen was also kidnapped by the system. His system task is: "Increase Lin Jianwei's favorability from 0 to 100. Failure punishment: always be the villain and be killed by the protagonist." The two people kidnapped by the system looked at each other. Xie Buchen drew his sword: "I'll kill you first and then think of a way." Lin Jianwei raised his hands: "Wait a minute! If you kill me, your mission will fail. The system says 'Always be a villain'. Are you sure you want to be chased by the protagonist forever?" Xie Buchen's sword stopped in mid-air. "So," Lin Jian smiled slightly, "How about... We cooperate?"