Chu Sheng awakens as a mosquito, equipped with a system that grows stronger through blood consumption. Doubtful about prospects in this form, he decides to experiment anyway. Fortune intervenes when he enters a chamber housing a stunningly beautiful woman—the ideal victim for his newfound power. Little does he know, his target is Gu Yuexi, an Emperor-Level Beast Tamer destined to become Empress. In her past life, she began Beast Taming at sixty with only a Low-Level Bloodline Demon Beast, her weak foundation ultimately leading to destruction during heavenly tribulation. Reborn at eighteen, Gu Yuexi fights for redemption. She depletes her family's fortune acquiring a High-Level Bloodline Demon Beast and meticulously arranges the Blood Covenant ritual—the sacred moment binding her and her beast together. Everything is perfectly arranged. Then fate intervenes. A mosquito lands on her leg and drinks her blood just moments before the ritual commences. Her carefully calculated plan shatters in an instant. "My name is Gu Yuexi," she whispers in despair. "It seems even in this life, I am destined to fail..."