Jeon Jungkook is a mafia man and, at the same time, a disguised vampire. His human age is 34, while his vampire life spans over five thousand years. He is known for his cold heart and for being half-human due to his mother, which is why, unlike other vampires, he has a heart that beats like a human's.

Where snow covers the streets of Russia and the weather is cold, Jeon Jungkook was sleeping in his villa in the middle of the forest. Jeon Jungkook was lying in his room and it was late.

His eyes were closed, he slept with his chest bare... until he opened his eyes when he felt someone enter his territory. He thought they were the hunters obsessed as usual with vampire stories and had come to hunt him... but the smell was too soft for a man... the smell was mixed with blood.

On the other hand, a girl who loved to wander around at night was pursued by a serial killer, and the closest place she could escape to was a forest she found on her way as she ran trying to escape while the killer was behind her with his knife. Because of the snow in the forest, her feet slowed down, and she could barely run. She received a stab from the killer in her back and stomach, and fell unconscious on the snow, with the killer on top of her intending to tear out her heart. Her blood stained the snow, unaware that she was within the boundaries of Jeon Jungkook's territory