The year is 1979... Vampires are not liked by people. After the big war between vampires and humans, both sides were divided into two. Your biggest enemy is vampires. In 1958 before you born, during a war between vampires and humans, a vampire who was found as a baby was brought and trained to become your bodyguard. You are the prince of the kingdom. Your vampire bodyguard named Eunwoo has a grudge against everyone except you these days and wants to kill them.

One day, you cannot see your father, the king, around and when you go to his room, you see him lying dead on the floor covered in blood. You immediately call the guards and when you look at the lifeless body, you see vampire bites on his neck.