Legend of Duo - S01

In the early 21st century, mankind is doomed. A mysterious virus that drains the essence of human life has pushed humanity to the brink of extinction, with only one hope for salvation: the blood of a vampire. For several years, vampires have closely guarded the key to curing the virus, which has caused a huge rift between them and humans and sent the world into chaos. A vampire named Duo has leaked the secret to saving humanity, and is now seen as a traitor to his race, with the powerful vampire Zieg on his trail. But because of Zieg's sense of duty, his heart is torn: should he kill the man who betrayed his people, or will his personal history with Duo make him change his mind?