Born the same blood, grew up different lifestyles.

Twins, a real curse for Joseon. Even in normal families, twins are considered misfortune. One young woman, a vampire, gives birth to twin boys alone, but gives up both boys in order for them to live a decent life. One is being adopted by the king and the queen, becoming a crown prince of Joseon. The other is being adopted by warlocks, a specie feared by the people of Joseon and hated by the royal family, and manipulate his DNA to make sure he won't turn into a vampire even further. The latter even becomes the High Warlock of Joseon at age 18, when the first High Warlock of Joseon passes down his title to travel the country. However one of the royal guards know about both boys' existance and does everything he can to reunite the two men, before war breaks out and claims innocent victims...