There is an undercurrent surging in the world of immortality, and demons from outside the world are back with a vengeance.
Yun Wulan, the astonishing genius who died in the past, "Master Wulan", faked his death and escaped, and transformed into the dark night walker "Ye Yin" to pursue it secretly. He unexpectedly reunited with Mo Xunyuan, the cold and stern swordsman who carries the seal of memory. One kept the secret while the other pursued it persistently. As strange cases occur one after another, all the clues point to their most respected master - the glorious leader of the righteous path.
When trust collapses and the truth is cruel, they must face a painful choice: should they wield a sword against their mentor, or become the enemy of the entire world? This is a battle about life, death and faith, a deep love that spans memory and time and space. When the stars fall, only the snow blade remains bright, illuminating the way home.
Mission: Tenacity and Redemption