Shen Yingyue is the Demon Lord's only son, and Gu Huaizhi is the Valley Lord of Medicine King Valley, who urgently needs a furnace cauldron because of an illness.
A coup breaks out among the demons. Thus, when the two first meet, Gu Huaizhi, with ulterior motives, saves the genuinely innocent Shen Yingyue.
Someone breaks both Shen Yingyue's legs, but luckily, the Immortal Lord takes devoted care of him.
To protect him, the Immortal Lord forfeits the Ice Marrow he had nearly obtained. In return, Shen Yingyue tests medicine for him and agrees to accompany him into a secret realm to search for a cure.
Before they encounter danger, the Immortal Lord tells him to run if things get perilous. But Gu Huaizhi is tricked by his enemy and falls off a cliff. Without a moment's hesitation, Shen Yingyue grabs hold of him, and they fall together.
During that time, Shen Yingyue learns about Gu Huaizhi's difficult childhood.
The former Valley Lord was a monster! He used disciples like them to test poisons!
Gu Huaizhi murdered his master and seized his position. He never expected that years later, in a desperate situation beneath a mountain valley, someone would still stay by his side.
So, in a moment of impulse, Gu Huaizhi says he wants to marry Shen Yingyue!
Shen Yingyue's life begins with a wealthy childhood, then falls into ruin overnight, before taking an unexpected turn and bringing him face to face with his true love, Gu Huaizhi.
He thought that he and Gu Huaizhi were in love with each other, and that the Immortal Lord was his moonlight!
But before the wedding, he learns the Immortal Lord's real intentions.
Gu Huaizhi is marrying him to use him as a furnace cauldron!
True love, a blood feud, the fact that a furnace cauldron has fewer than ten years to live: Gu Huaizhi doesn't care about any of it! What does Shen Yingyue's life matter when Gu Huaizhi's own is at stake?
So, that day, Shen Yingyue turns the tables and absorbs all the Immortal Lord's cultivation!
2.
Years later, the two clans negotiate peace.
The outside world says Gu Huaizhi and Shen Yingyue are bitter enemies.
So the humans plan to present the former Valley Lord of Medicine King Valley to the former Demon Lord, hoping to secure greater benefits for their people. But with nowhere else to turn, Gu Huaizhi ends up barging into the cave dwelling of Shen Yingyue, the former Demon Lord!
Exes meet again, just when one of them has fallen on hard times.
The Immortal Lord sucks in a sharp breath and backs away, trying to escape.
But he's trapped between pursuers in front and enemies behind, and the chase is closing in!
So Gu Huaizhi throws caution to the wind and embraces Shen Yingyue, hoping the demon will remember their past and spare him.
But Shen Yingyue says, "How does the Immortal Lord plan to repay the life debt he owes me?"
The self-important Immortal Lord thinks, What's the worst that could happen? He'll just want to get back together.
Who could have guessed that later, Shen Yingyue would cover his mouth and, heedless of his disgust, pour spiritual energy into his throat and down to his belly, saying, "Then how about the Immortal Lord gives me a little demon?"
Early on: An innocent, kind flower of an aggressive lead x a gentle, protective Immortal Lord as the receptive lead.
Later: A demon who loves to bully the Immortal Lord as the aggressive lead x a worldly man whose true nature is exposed, tough yet timid, as the receptive lead.
Note: No pregnancy or childbirth. It's just little Shen's hobby: when he returns the spiritual energy, he presses on the Immortal Lord's belly. Little Gu can't do anything about it. He needs to survive and recover his cultivation, and every time, he can't tell if Shen is serious. He's scared out of his wits, and sometimes he curses him (he has nothing left to lose, anyway).
Important: Both are powerful.
Little Gu doesn't resent it, nor does he say that because he did something to little Shen back then, little Shen must do the same to him. After all, no matter how morally bankrupt his moonlight may be, the life debt is real. But neither of them says they love the other, because when villains speak sincerely, it ruins the magic.
Theme: Be sincere with others. Scheme less, and things are less likely to backfire.
My Sickly Senior Brother Is Madly in Love With Me
My Trashy Wife Keeps Dying for Love
After the Death of the Female Lord I Framed and Sent to Prison, I Returned to That Year
After His Pregnant Wife Lost His Memory
Even After Death, I Still Have to Tie Red Strings for My Wife
My Late Senior Brother Insists on a Teacher-Disciple Romance
The Comments Say I Bought a Disabled General
I Heard I’m a Scumbag? Me? A SCUMBAG?!
My Female Lord Was Reborn Before My Mission?