Prologue
In a place with no historical records, there are four major races: the spirit race, the demon race, the demon race, and the human race.
Here in the underworld, a soul envoy is selected every 1,000 years, and any princess or prince from each country is eligible to be selected.
Soul Messenger, as the name suggests, is a messenger of the soul, with the power to purify and guide the soul. The underworld butterfly is the symbol of the soul's identity. Each soul represents a color, but the soul that represents black is called a "forbidden soul". Because he not only has the power to purify and guide souls, but also has the power to control souls. . .
Because a disaster caused by "forbidden souls" 5,000 years ago almost destroyed the entire world, so once the emergence of "forbidden souls" is discovered, they will be killed to avoid repeating the situation that year. . .
The 1,000-year soul envoy selection competition is about to begin again. Will the "forbidden soul" that has been killed appear again? ! Who is the person behind all this? !