In the three realms of the universe, the Heavenly Dao reigns supreme, the Human Dao is the arena, and the Demonic Dao is the blade.
A single thought in the human heart can reach the heart of Heaven; a lifetime's deeds in the mortal world can drag one down from the Heavenly Dao.
Legend has it that when evil thoughts in the mortal world pile up beyond what the Heavenly Dao can bear, a "Great Purge" capable of destroying all civilization will descend, like the global flood of ancient times: sparing neither good nor evil, leaving no survivors.
The great powers who guard the three realms abide by one cold, ironclad rule: if people have been led astray and cannot come to their senses on their own, they are like crooked trees. They can only be cut down, never saved.
Shen Yuan is an ordinary man whom the Heavenly Dao has judged to be "among those soon to be purged." Yet in the final seven days before the great flood arrives, he awakens an ability the Heavenly Dao never foresaw: he can hear the faint, still-burning goodness deep within every "crooked tree."
If even a crooked tree can grow straight, can the Heavenly Dao's verdict of purging be rewritten?
If the human heart truly cannot be changed, then why can he hear those dying voices struggle?
This is a story about protection and giving up, salvation and purging, the coldness of the Heavenly Dao and the warmth of the human heart.
With the fate of the three realms resting in one man's hands, he will wager his life on an answer even the Heavenly Dao dares not bet on.