For thousands of years, the world has been divided into three realms: Heaven, ruled by the Seven Divine Guardians; the Mortal Realm, where humanity flourished beneath divine protection; and the Abyss, a land of demons feared by all.

Long before he became the Devil King, Xie Yuan was Heaven's greatest general. Revered as the strongest of the Seven Divine Guardians, he faithfully protected the realms until he uncovered Heaven's darkest secret. The gods did not simply preserve balance—they manipulated fate itself, deciding which kingdoms prospered and erasing anyone who threatened their authority.

Unable to accept such tyranny, Xie Yuan rebelled against Heaven.

The rebellion failed.

Unable to kill someone of his power, the Seven Divine Guardians cast him into the Abyss through a forbidden ritual. Instead of dying, he absorbed the Abyss' endless demonic energy and returned as the Devil King, ruler of the Devil Realm and Heaven's greatest enemy.

For centuries, war raged between Heaven and the Devil King, yet neither side could destroy the other.

Meanwhile, you were born into the House of Saints, a sacred bloodline blessed by Heaven. Every descendant awakened divine magic capable of healing, purification, or wielding holy light.

Except you.

No matter how many rituals were performed, your body never responded. Believing Heaven had abandoned you, your family declared you a disgrace.

What they never knew was that you possessed the legendary Null Vessel—a body that generated no spiritual power of its own but could safely contain both divine and demonic energy without rejection.

Ashamed of your existence, they abandoned you on the Sacred Isolation Mountain, claiming the mountain's spiritual pressure would awaken your blessing. In truth, they expected you to die there.

Years later, the sky suddenly split apart.

The Seven Divine Guardians descended, confronting Xie Yuan in a final battle. Their goal was not to kill him—they knew that was impossible—but to imprison him forever using the Heavenly Locking Seal, a divine formation capable of binding even the Devil King's soul.

As the seal closed, Xie Yuan discovered the formation's only flaw—you. Because your Null Vessel possessed no divine resonance, Heaven's seal could not recognize your existence. You were the only vessel capable of containing his soul.

With no other choice, he activated the forbidden technique Soul Transposition.

The moment the Heavenly Locking Seal descended, your souls were exchanged.

You awakened inside the Devil King's body.

Xie Yuan awakened inside yours.

The Seven Divine Guardians saw only the Devil King's body standing within the seal. Believing they had captured Xie Yuan, they immediately chained you with divine restraints and imprisoned you within Heaven.

Meanwhile, hidden inside your ordinary body, Xie Yuan escaped unnoticed. Your Null Vessel concealed his true identity, allowing him to walk freely while every Guardian celebrated their victory.

Days later, Heaven's prison shook violently.

Black flames engulfed the celestial palace as demons stormed its gates.

At their head stood a familiar figure.

Xie Yuan.

Wearing your face.

Though your frail body suppressed much of his power, he carved a path through Heaven's defenses until he reached your prison.

With a single strike, the divine chains shattered.

His crimson eyes met yours as he frowned in annoyance.

"You've done a terrible job protecting my body."

You stared at him, speechless.

He extended his hand.

"Come. I have no intention of leaving my body in Heaven's custody."

Without waiting for your answer, he pulled you toward a portal of black flames leading to the Devil Realm.