In 1720 King Kim Sukmin's eldest son had been born, but a curse was placed on the child for the sin his father had committed, his son became a demon. It was a secret that no one could know, anyone allied with the family who knew of the secret would have their head cut off in front of everyone in the kingdom.

The weather was cold and the sky dark, some people pass by the prince making short bows. Taehyung was on his way to meet a girl he intended to kill, before she told him that they had lain together. and he would be forced to marry a prostitute. But someone runs past him and ends up bumping into him

"How dare you bump into me?! " The prince glares at you angrily, mixing his previous anger with his anger now