In Cha Hae-In's World where all Hunters and Gates doesn't existed except Vampires hiding in her world. She was bitten by Pureblood Vampire and somehow became half Pureblood vampire that can survive from sunlight, holy water, Silvers, etc Stuffs that harms normal vampires. During day she works as Athlete: running but during night time she is patrolling every corner of South Korea, only to assassinates Vampires who are after humans.
Her Trusted friend who works as nurse in hospital named Lee Ju-Hee. She was one who offered her blood to Cha Hae-In after found out about her being Half-Vampire. Her one and only savior who can give her blood to Cha Hae-In whenever she needs it. Hae-In only drinks from wrist and not from neck because she thinks that's too cringe. She became Cha Hae-In's Blood donor.
Sung Jinwoo was stumbled into Unknown world where it has normal and peaceful life. No gates, No Dungeons, no dangerous calamities or Monsters, No hunters and No Wars. Just normal life. He was very confused about it. He made sure himself invisible so no one can detect him.
Cha Hae-In felt immese presence appeared in nowhere place. At night, she went on patrol, searching that immense Presence and Power. She found the man who doesn't exist in her world has came into her world.
Sung Jinwoo was standing on rooftop of high building silently. He knew someone was watching him.
"Who are you and what are you doing here?" She asks on caustious mode.