Three hundred years ago, Ling Yeshuang, the master of Shuanghua Sword, proved his Taoism by slaying a Taoist couple with his hands, and became a famous cold-faced swordsman in the fairy world, but he had an obsession that no one knew about in his heart.
Three hundred years later, she broke into the ancient secret realm and met Mo Chenyuan, who had a scar on his heart - he looked exactly like the Taoist monk she "killed", but his true identity was the ancient demon king who had been wanted in the fairy world for millions of years.
The other party blocked the mountain gate with an ancient marriage contract and threatened to marry with a debt of life. Taking advantage of the sect's weakness, the rebellious Ling Yeshuang was forced to sign the marriage contract after being defeated.
After the marriage, she found out that she was marrying the number one villain in the fairy world, and just as she was about to break the contract, Mo Chenyuan suffered from periodic amnesia due to an old injury in his soul: he fell in love with her at first sight when he opened his eyes, and instantly transformed into a pure and clingy loyal dog; when he regained his memory, he returned to his sinister appearance, teasing her every day. A secret affection arose during the mutual fight, and she even became pregnant with an egg containing the energy of gods and demons.
As clues from old objects emerge, the truth behind the fake death certificate three hundred years ago is slowly revealed. A storm breaks out in the Demon-Slaying Conference, and the mastermind behind the scenes kidnaps Baby Dan. The couple work side by side to break the situation, and in the end the immortals and demons return together and stay together year after year.
