Nightblood: Eternal Oath

**Introduction to the "Dark Night Bloodline" series** In a city where modernity and mystery intersect, special case investigator Han Yu investigates a series of bizarre murders and discovers that the blood of the victims has been drained, and ancient vampire marks are left on the scene. With in-depth investigation, he got acquainted with forensic doctor Su Qing and the mysterious woman Yi Irene, and gradually revealed a secret that had been hidden for thousands of years - the true existence of vampires, and he has the blood of the Guardian flowing in his own body, and he is the only one who can fight against the ancient vampire organization "Scarlet Eye".