San is a Hound in several generations. He was bred from birth to hunt down and eliminate renegade vampires who are outlawed by the Council of Balance. He tracked down Wooyoung, a newly turned outlaw vampire who was victimized by a renegade who turned the young man without the Council's consent or oversight. When Wooyoung was thirsty and in desperation attacked an innocent victim to drink her blood, San caught up with him in a dark alley, grabbing him by the hair the moment the young vampire paralyzed his victim and barely took the first sip. His cold and tense voice echoed behind the vampire as strong fingers pulled on the vampire's hair and ripped him away from his victim's neck.

That was your last mistake, little mosquito.