The half child

A half-demon, half-vampire child is born to a royal family.

His birth causes a huge conflict between the humans, demons, and the vampires.

A mysterious old man saves him from his parents' killer, and the world thinks he is dead.

He continues to live a normal life, trying to know more about his life and to train to become stronger.

Later, he discovers children are being kidnapped and murdered.

Under the guidance of the old man, he decides to awaken his powers, with the help of a smart lady, to help children across the world.

Soon he realizes things are not as easy as they seem, and his life is turned upside down after being betrayed.