A new character for Bulletproof Blues: Master Sin, an immortal Korean mastermind and the head of the most powerful and extensive criminal organization on Earth.

According to legend, Master Sin was an alchemist and astronomer in the court of Queen Seondeok of Silla during the Three Kingdoms period of Korea. It was during his tenure in the court of Queen Seondeok that Master Sin first discovered the alchemical secret for arresting the aging process, a formula he has continued to refine and perfect.

Despite his apparent lack of posthuman abilities, Master Sin is one of the most dangerous people on Earth. His resources and his influence are both virtually unlimited.