A Nurse Wears a Vicious Female Supporting Character in a Book to Defeat the Undead Villain

I, Sen Shumiao, a nurse in the 21st century, read a novel while working the late night shift. Suddenly, I died and transformed into the vicious female supporting character in the book. The system asked the male protagonist to reach 100 points of favorability before returning to the real world. I didn't expect that the system would do something wrong. The character portrait in the book was wrong... My target for strategy became Yin Changsheng, the beautiful, powerful, miserable and immortal villain. It is said that his blood can cure all diseases, so countless people used him to hurt him, causing his blackness value to become higher and higher. How should I strategy for this? !