Byun Baekhyun was once a human who turned into a vampire. When he was a kid, he had a friend vampire but his parents took him away from his friend. After a few years, his parents were killed by vampires. His parents left him to his grandmother who always had him locked up inside their house for his own safety. At the age of nineteen, his grandmother died. Being weak and dependent, he didn't know where to go. He met his old friend whom he though he could trust.

He thought his old vampire friend was going to take him to a safe place. But instead, took him in a dark alley where no one was able to hear his screams of help. There was a group of vampires that were going to take advantage of his weakness and that's when he got bitten. But before they could actually take advantage of him and kill him, a vampire saved him.

He woke up in an abandoned house and saw a letter in his hands.

'Star Blood Academy'