The secret realm of Chu Mountain is about to open, and the Stone of Guixu has appeared, stirring up turmoil across the Three Realms.
Shen Cixue, the aloof and solitary Demon Lord, descends into the mortal world with demonic energy, seeking a key that can break the shackles of the Heavenly Dao. Wen Jingheng, the gentle and refined leader of the immortal sect, comes down to the mortal realm with his sword of pure light, hoping to protect all living beings from the secrets that threaten to engulf them.
A jade pendant engraved with "Yungui" brings these two people, whose paths as immortal and demon should never cross, together by fate.
Deep within the secret realm, memories of their past lives as a sword spirit and a God of War come surging back. Amid the flames of war in the Three Realms, they turn against their masters and defy the Heavenly Dao, making torches of themselves to illuminate the chaotic, endless night of conflict between immortals and demons.
When the dust finally settles, the clouds return to Chu Mountain at dusk. All they wish for is to share a peaceful life with each other, as snow falls.
Theme: The common good and oneself