I Am a Cannon Fodder, and I Rely on Sucking the Devil to Survive.

Su Qingli was transformed into the cannon fodder female supporting character of the same name in the book. At the beginning, she was framed for having an affair with her junior brother Mo Ye, who was an orphan of the demon clan, and was imprisoned in a coffin to die. After the system was bound, she was forced to start "healing" Mo Ye. While completing the demanding tasks issued by the system to gain vitality, she also had to avoid the pursuit of her and Mo Ye by righteous people. Mo Ye found that only this woman could relieve his pain, and only by staying close to her could he survive. When the heroine of the original book came with the halo of the protagonist and tried to "rescue" Mo Ye, she found that Mo Ye had already become a "vicious dog" who only listened to Su Qingli. Su Qingli used her tricks to give Mo Ye the power to compete with everything. In the end, in a world-ending crisis, Su Qingli chose to sacrifice herself for the last "cure" in order to save the people. The truth was revealed to the world, and the crematorium was opened for all members. Mo Ye, who had become the Demon Lord, would travel across the nine heavens and ten places just to resurrect his only one.