I Became Cannon Fodder and Ended Up With the Female Lead [Book Transmigration]

My new story, After I Wronged the Crazy Female Lead, She Turned Evil, is now out. Please add it to your favorites~ Ever since Yue Xi clicked the mysterious link her friend sent her, she had discovered a whole new world. One day, while reading a heart-fluttering GL novel, she transmigrated into the book because she felt sorry for Qinghe, the heroine with a tragic past. Other people who transmigrate into books either get a power fantasy, leveling up and beating monsters, or a romance story, all sweet and lovey-dovey. Yue Xi was different. She became a cannon-fodder demon hunter who opposed the heroine and met a gruesome end. The only person who could save her, her master, had died just three seconds before she arrived. Yue Xi: Let it all burn. I'm tired. After thinking it over, she decided to make the first move. Before Qinghe turned evil, Yue Xi would boost her favorability as much as possible and make sure she survived to the end. On the day they went down the mountain, she casually saved a young woman who was being attacked by monsters. Struck by her looks, Yue Xi decided to take her home as a cultivation partner once she'd finished winning Qinghe over. The young woman looked frail and easily embarrassed, blushing at the slightest thing. Whenever danger appeared, she'd hide behind Yue Xi, who treated her like a little princess. That was until Yue Xi saw the Demon King kneeling in front of the young woman, weeping as he poured out his grievances. Yue Xi: ??? The young woman smiled sweetly and tugged at her sleeve. "Sister, you won't stop liking Qinghe, will you?" Yue Xi froze. So the little tail she'd been carrying around and cuddling this whole time was the future Great Demon King, powerful enough to turn the clouds with one hand and rain with the other? That night, Qinghe climbed into Yue Xi's bed as usual, but Yue Xi sternly refused her. The heroine belonged with the second female lead. How could a cannon-fodder character like her even entertain the thought? Once she was sure Qinghe had no intention of killing her, Yue Xi quietly ran away, ready to enjoy her freedom. Qinghe's corruption level instantly hit its peak. When they met again, the girl who used to softly call her "sister" had completely changed. Demonic energy swirled around her, and a crimson Fallen God mark appeared between her brows. "You promised to protect me for the rest of my life. How could you leave me all alone, Sister?" Yue Xi didn't dare make a sound. The God-Binding Chains jingled with every movement as she struggled. I should never have run away. Boohoo~ Theme: Exorcise demons and uphold the righteous path of the world