The flirtatious beauty Gu Yi binds herself to a System.
The System requires her to enter a book and win over the scattered three souls of the villain, stopping them from reuniting, merging the three realms, and bringing about a tragedy that leaves all living things in ruins.
In the book, the villain's three souls take the form of:
A lofty, aloof immortal who cares for all living beings.
A selfish ruler who neglects his studies and indulges in pleasure.
A cruel and ruthless Demon Lord who acts without mercy.
Gu Yi knows that men are fools who always want something new and are drawn to traits they don't have themselves.
So, during the day, Gu Yi wears a pure white immortal's robe and enters the demon realm, playing an innocent, kindhearted little white flower.
At noon, she dresses plainly and carries a book of sage teachings into the mortal realm, playing a bookworm who is devoted to her studies and despises men.
At night, she wears a vivid red robe rarely seen in the immortal realm, playing a shameless seductress who deliberately tempts men.
Through tireless time management, Gu Yi successfully wins over all three male leads.
She thinks her mission is complete, the world is at peace, and she can happily keep her men on the hook.
That is, until one day, a bittersweet love note she writes on a whim gets sent to the wrong person.
The immortal revered by all three realms receives: "People call you selfish and cold, but I think you're the finest thing in this world."
The mortal ruler, who can't use magic, receives: "I can't forget it: the stars filling the sky that you conjured for me among the flowers by the River of Forgetfulness."
The short-tempered, arrogant Demon Lord receives: "Your tenderness is like a gentle breeze, stirring ripples in the sea of my heart."
The three of them: ...
When she realizes she's sent the love notes to the wrong people, Gu Yi, who loves life and fears death, knows there's no place for her in the three realms. She fakes her death and returns to her original world.
When she opens her eyes again, Gu Yi is imprisoned in a dungeon, her wrists shackled with iron chains as thick as her arms.
The villain sometimes takes the form of the Demon Lord. Dressed in white, he plays the refined gentleman from her letter. "That day, you pleaded with me to spare the maid who had hurt you, but afterward you threw her into the Ravine of Ten Thousand Beasts to be torn apart. I know how vile you are, yet I still love you."
Sometimes he takes the form of the mortal ruler. He gently strokes her cheek, his voice dark. "You pretended to be hardworking, studious, and uninterested in men. I know that when I was away, you covered your eyes and had those burly guards take off their shirts to play catch the butterfly with you. I indulged you and let you do as you pleased, but you fell in love with someone else?"
Sometimes he takes the form of the lofty Immortal Venerable, dressed in black. He grips her throat and kisses her, his eyes filled with an obsessive madness she's never seen before. "You're the most honest version of yourself when you're with me. Am I the one you love most?"
"Answer me!"
Gu Yi breaks down. "Aren't you all the same person? Why are you jealous of yourselves?"
The day Gu Yi left, clouds and fog shrouded the sky, the earth shook, and the three realms were forcibly merged.
In the new world, a million bodies lay dead and rivers ran red with blood. Their Creator had arrived.
Theme: Devotion and loyalty