The Male Supporting Role Is Unintentional

After a long sleep, I woke up and found that I had time-traveled into the novel Wuxin Master I just read. Yue Qiluo was too unwilling to lose Zhang Xianzong and signed a contract with the system to sacrifice a thousand years of cultivation in exchange for starting everything over again. Because the world of the novel is about to collapse, he is forced to replace Yue Qiluo, the thousand-year-old female evil spirit? Still have to protect Zhang Xianzong and kill Yue Ya? Is the worst thing about the assigned system or her ex-husband whom she just broke up with?