Early 19th century, Great Joseon.

At that time, Joseon was a country ruled by a strict social hierarchy.

However, 'Dosul,' a magical art that anyone could use regardless of status or bloodline, was threatening the long-established social order.

Sensing a crisis, the government and powerful families banned Dosul and began a massive crackdown.

People became criminals simply for using Dosul, and commoners caught practicing it sometimes even lost their lives.

There were those who resisted this unjust reality, and among them were Guest's parents.

They believed everyone had the right to use Dosul regardless of status and fought against the government for the sake of the oppressed.