Underworld power struggles x a mutually obsessed pair of lunatics
Yue Yi, the poison-mad doctor who terrifies the medical world, is reincarnated as the medicinal consort whom King of the Underworld Chen Yuan forcibly marries to save his mother.
On their wedding night, before her veil is even lifted, a dagger plunges into her chest. "I'm borrowing your heart."
This marriage was meant to be a cruel sacrifice. The old underworld physician, just returned from traveling the Nine Provinces, had declared that only her "Nine-Turn Sacred Spirit Heart" could cure the poison afflicting the Supreme One of the Underworld.
Though Supreme One Xuan Ji refuses the heretical heart-transplant ritual to prolong her life, she cannot sway the king's obsession. In the end, she gives Yue Yi a place to rest by granting her the title of Underworld Consort and setting up a memorial tablet for her, meant to last forever.
Yue Yi, who died on her wedding night, opens her eyes again and smiles, turning the hairpin against Chen Yuan's throat. "How convenient, I just poisoned myself to death too... I hear Your Majesty wants to cut out my heart? Why don't we find out which is faster, your blade or my Soul-Eating poison?"
Chen Yuan only replies with amused interest, "How intriguing."
Years later, when the story comes up again, the mad king buries his face against her neck. "I'll cut out my own heart and offer it to you! Please, darling... make a Heart-Linked Gu, so our blood burns as one. What do you say?"
Yue Yi's eye twitches. "You're sick."
"Please, darling, show me some affection."
Helpless, Yue Yi presses her poisoned hairpin to Chen Yuan's heart. The poison called "Bone-Eroding Bliss" coating its tip seeps into his black dragon robe. "Your Majesty, do you want your heart cut out while you're alive, or do you want to be carved open?"
Chen Yuan suddenly grabs the hairpin and drives it deep into his own heart. Blood soaks the red gem at its end, and laughter spills from his throat:
"What fun is there in cutting out a heart? I want you to poison this heart... seep through my veins, so that from now on, every beat of my heart..."
He suddenly pulls her close by the nape and licks her lips clean. "...is only for you, darling."
When the Underworld's power collides with a human-shaped nuclear bomb of a poison consort, turmoil across the Three Realms becomes a cauldron for Gu.
The Ninefold Springs burn with poisonous fire, and the flowers on the other shore bloom into a wedding bed.
In this mad love pledged with their lives,
who is whose antidote?
And who... is whose poison?
