**"I want you to remember this sword for three hundred years."**
Xiuyun Wuya, the number one swordsman in the world of cultivation, killed the nine-tailed fox king Yan Ming with his own hands three hundred years ago. From then on, his silver hair was like snow and his heart was as cold as frost. Until he caught a young man with a fox mark on his wrist at the scene of the murder - Yan Jiuli, the son of Yan Ming, the little fox who should have been in despair.
"Why is the wound on Master's heart exactly the same as mine?"
Forced to disguise themselves as master and apprentice, the two gradually uncovered the cruel truth when the Netherworld Sect reappeared in crisis: the sword back then was actually the contract requested by Yan Ming, and half of the Demon God's heart was hidden in Yun Wuya's body, while the other half was locked in Yan Jiuli's blood. What's even more frightening is that the feelings that arise when their scars touch are the final key to breaking the ancient seal...
"Axue, do you want to kill me again?"
"No, this time I will accompany you to the sky."
Intention: The sharpest sword can never cut off the most lingering bonds.