What Did You Say? I Am the Seventh True Ancestor.

St. Valentine's Academy, hidden deep in the snowy mountains of the Alps, is a special zone for European demons that was opened after humans and the supernatural world concluded a treaty. Here, descendants of nobles from various races such as vampires, werewolves, witches, and fallen angels gather together. It is the top academic institution in the supernatural world and also a battlefield for gambling with undercurrents. Lin Ye, an "ordinary human" boy, has been burdened with the mystery of his parents' mysterious death since he was a child. Following his grandmother's orders, he took an ancestral bloody cross and a mysterious invitation and entered this forbidden academy that only accepts alien extraordinary people. As the only human student in the academy, he was jealous and hostile when he first entered the campus. He was watched and monitored by the pure-blood vampire princess Alice, and he was deeply scrutinized by various forces. No one knew that the blood of the Seventh True Ancestor, which had been lost for thousands of years, was sleeping inside the seemingly weak human boy. At the moment of life and death when the crisis comes, the bloody cross unlocks the divine power, and Lin Ye unlocks twelve exclusive concept-level beasts. The awakening of each beast requires the conclusion of a deep blood contract with the alien girl. The cold vampire queen, the arrogant genius witch, the loyal dog werewolf princess, and the mysterious fallen angel senior sister are all bound to him. Since then, the ordinary boy has reversed his fate and risen through the cracks of the Holy See Inquisition, the intrigues of the Vampire Senate, and the disputes between various ethnic groups. "What, you said you want to eliminate me? Go ahead and talk to my true ancestor bloodline!"