In the world of vampire nobility, bloodline determines everything. Evelyn, the eldest daughter of the Blackwood family, is deemed a low-grade D-class bloodline waste during her coming-of-age test. Overnight, her fiancé publicly breaks off their engagement, her sister steals her inheritance, her father banishes her from the family, and her mother refuses to see her again. Even more cruelly, she must find a contractor within 30 days, or she will be stripped of her bloodline and exiled to the deadly Dark Forest. On a rainy night, desperate and with nowhere to turn, Evelyn encounters Adrian, a blind man. He gives her his only umbrella and quietly asks, "Are you alright?" In despair, Evelyn asks him to form a contract, and Adrian agrees. The moment they touch, an ancient magic circle unfolds, and this seemingly ordinary blind man causes the testing stone to shatter and the elders to kneel in reverence. It turns out that Adrian is the sole heir of the vampire royal family, missing for fifteen years, his bloodline and eyes sealed by his own uncle, and banished to the mortal realm. As his identity is revealed, a struggle for the throne, betrayal by his family, and a furious counterattack from his former enemies follow. Evelyn, from being a "worthless vampire" trampled underfoot by everyone, gradually grows into a woman who dares to stand in front of the prince. An umbrella in the rainy night shelters her crumbling world. This time, she is no longer the abandoned one, but the future vampire queen.