Clouds covered the crescent moon. Street lamps barely illuminated the damp pavement. The stench of petrichor filled the nose of a young man, tanned and slender, carefully treading his way through an alley. It was far too late for someone of his age to be out, nearly midnight.

The witching hour is nigh, he thought. He chuckled to himself, perfect lips stretching over rows of pearly white teeth. Two muscular arms swung by his sides, unaffected by the bitter chill setting in over the city. The only thoughts on the man's mind were brainless, petty thoughts.

He walked with brisk, measured steps, allowing the silence of the night to envelop him. A single drop of water against his skin brought his gaze to the sky. A few minutes later, his clothes were soaked through. Not that he minded. Years with a water-loving friend had trained him for this moment.

Amidst the plops of raindrops on the wet asphalt, the man heard something unusual. Delicate taps, ripples, heavier than those caused by raindrops, marring the surfaces of the already-forming puddles. It sounded like footfalls.

Without turning around, the man could tell the footsteps belonged to a girl between the ages of six to eight. Small for her age, a hundred and seventeen centimeters, twenty-three kilograms. Nice shoes. Not at all ideal for the weather.

The young man turned around and drank in the image of her pigtails, curled meticulously by some overbearing mother. Pink dress, somehow not stained with mud. Her once-pristine white socks, however, were a different story. He had been right about the shoes.

"Oppa?" she asked.

The man knelt down and met her eye. "What's your name?" he questioned.

"Seoyul. Do Seoyul," she replied softly.

"What's wrong?"

She sniffled, and the man noticed for the first time the moisture in her eyes. "I-I lost my brother."

The man frowned. "Where'd you last see him?"

"In the park. We were walking and I wandered off and I ended up here and please help me!"

He nodded, motioning for Seoyul to lead the way out of the alley. He followed behind her at a safe distance so as not to make her uncomfortable. His eyes scanned her petite frame, searching for any scars or signs of a struggle, thinking maybe this girl had been kidnapped. What he discovered was a mark, mostly hidden by the collar of her dress, just under her neck.

"Hey, Seoyul?" the young man asked uncertainly. Seoyul turned around.

"Yes, oppa?"

"What did you say your brother's name was?"

"Do Kyungsoo."

The man's eyes widened. He said nothing and continued to allow Seoyul to lead him out. Suddenly, he lunged at her, yanking the back of her dress down.

"Oppa!" she cried. "What are you doing?"

"I knew it," he hissed. The mark he had noticed before was revealed completely. A circle and a flame in the center. He pressed his thumb to the flame, watching as a bright light emanated from Seoyul's body.

Seoyul, if you could even call her that now, let out a blood-curdling scream as her body doubled in size. He was surprised she didn't wake the whole neighborhood. He stared, fascinated, as her muscles bulged and her fingernails extended into claws. Her round face became long and angular and her lips curled back in a sneer, revealing long fangs. Her dress shredded, falling off her body in tatters and leaving her in nothing but her own scaly, black skin.

"You !" the demon shrieked. It threw an arm forward, a futile attempt to claw through the man's body. The man didn't even flinch. Instead, he reached into his coat pocket, pulling out what seemed to be a laser gun. He pulled the trigger, so quickly one wonders where he had the time to aim. The demon cried out in pain, clutched its leg, and fell to the side.

"Who is your master?" the man demanded, perfect features contorting into a scowl.

The demon, somewhere in between screams, choked out, "You know perfectly well who he is."

The man smirked. "You're right. Tell him I say hi."

"He will end you!" the demon shouted.

"Not before we end him," the man chuckled, twirling the gun in his fingers. He pointed it again, this time at the demon's chest. "Now go, before I shoot you again."

The demon, terrified of the powerful human standing before it, fled as fast as it could. It spun on its heel -- a strangely girlish and elegant move -- and sprinted out of the alley, almost punching a hole in the wall in the process.

The man grinned to himself and admired the scene of the crime. Demon blood, a black, viscous, disgusting smelling liquid pooled where the demon had been. He quickly placed his hand into it, causing it to vanish as if into his fingers. The evidence removed, he focused his mind on his destination. The walls closed in on him, crushing him until he couldn't breathe. He shut his eyes tight.

When he opened them, he was standing before a tall, handsome-faced man in what seemed to be a control room. The man smiled, an unnatural feature on his stern face. He opened his mouth to speak. "Welcome back."

"I have news," the demon killer announced smugly.

The handsome man's grin widened. "Better be good, Kai."

Clouds covered the crescent moon. Street lamps barely illuminated the damp pavement. The stench of petrichor filled the nose of a young man, tanned and slender, carefully treading his way through an alley. It was far too late for someone of his age to be out, nearly midnight.

The witching hour is nigh, he thought. He chuckled to himself, perfect lips stretching over rows of pearly white teeth. Two muscular arms swung by his sides, unaffected by the bitter chill setting in over the city. The only thoughts on the man's mind were brainless, petty thoughts.

He walked with brisk, measured steps, allowing the silence of the night to envelop him. A single drop of water against his skin brought his gaze to the sky. A few minutes later, his clothes were soaked through. Not that he minded. Years with a water-loving friend had trained him for this moment.

Amidst the plops of raindrops on the wet asphalt, the man heard something unusual. Delicate taps, ripples, heavier than those caused by raindrops, marring the surfaces of the already-forming puddles. It sounded like footfalls.

Without turning around, the man could tell the footsteps belonged to a girl between the ages of six to eight. Small for her age, a hundred and seventeen centimeters, twenty-three kilograms. Nice shoes. Not at all ideal for the weather.

The young man turned around and drank in the image of her pigtails, curled meticulously by some overbearing mother. Pink dress, somehow not stained with mud. Her once-pristine white socks, however, were a different story. He had been right about the shoes.

"Oppa?" she asked.

The man knelt down and met her eye. "What's your name?" he questioned.

"Seoyul. Do Seoyul," she replied softly.

"What's wrong?"

She sniffled, and the man noticed for the first time the moisture in her eyes. "I-I lost my brother."

The man frowned. "Where'd you last see him?"

"In the park. We were walking and I wandered off and I ended up here and please help me!"

He nodded, motioning for Seoyul to lead the way out of the alley. He followed behind her at a safe distance so as not to make her uncomfortable. His eyes scanned her petite frame, searching for any scars or signs of a struggle, thinking maybe this girl had been kidnapped. What he discovered was a mark, mostly hidden by the collar of her dress, just under her neck.

"Hey, Seoyul?" the young man asked uncertainly. Seoyul turned around.

"Yes, oppa?"

"What did you say your brother's name was?"

"Do Kyungsoo."

The man's eyes widened. He said nothing and continued to allow Seoyul to lead him out. Suddenly, he lunged at her, yanking the back of her dress down.

"Oppa!" she cried. "What are you doing?"

"I knew it," he hissed. The mark he had noticed before was revealed completely. A circle and a flame in the center. He pressed his thumb to the flame, watching as a bright light emanated from Seoyul's body.

Seoyul, if you could even call her that now, let out a blood-curdling scream as her body doubled in size. He was surprised she didn't wake the whole neighborhood. He stared, fascinated, as her muscles bulged and her fingernails extended into claws. Her round face became long and angular and her lips curled back in a sneer, revealing long fangs. Her dress shredded, falling off her body in tatters and leaving her in nothing but her own scaly, black skin.

"You !" the demon shrieked. It threw an arm forward, a futile attempt to claw through the man's body. The man didn't even flinch. Instead, he reached into his coat pocket, pulling out what seemed to be a laser gun. He pulled the trigger, so quickly one wonders where he had the time to aim. The demon cried out in pain, clutched its leg, and fell to the side.

"Who is your master?" the man demanded, perfect features contorting into a scowl.

The demon, somewhere in between screams, choked out, "You know perfectly well who he is."

The man smirked. "You're right. Tell him I say hi."

"He will end you!" the demon shouted.

"Not before we end him," the man chuckled, twirling the gun in his fingers. He pointed it again, this time at the demon's chest. "Now go, before I shoot you again."

The demon, terrified of the powerful human standing before it, fled as fast as it could. It spun on its heel -- a strangely girlish and elegant move -- and sprinted out of the alley, almost punching a hole in the wall in the process.

The man grinned to himself and admired the scene of the crime. Demon blood, a black, viscous, disgusting smelling liquid pooled where the demon had been. He quickly placed his hand into it, causing it to vanish as if into his fingers. The evidence removed, he focused his mind on his destination. The walls closed in on him, crushing him until he couldn't breathe. He shut his eyes tight.

When he opened them, he was standing before a tall, handsome-faced man in what seemed to be a control room. The man smiled, an unnatural feature on his stern face. He opened his mouth to speak. "Welcome back."

"I have news," the demon killer announced smugly.

The handsome man's grin widened. "Better be good, Kai."

A/N: Here's the prologue. I was being a stupid author and I forgot to post on AFF so this is already on Wattpad. I'll post everything I have all at once. Thank you to those of you who subscribed without reading anything! Am I really that good at writing descriptions? Thank you!