Shi Yan, a top assassin who was dying, was thrown into the infinite purgatory called [Abyss of Reincarnation]. His first mission is to save a young man named Su Xiao who will die within seven days. Shi Yan regarded it as an ordinary killing mission until the young man whispered in his ear: "Those voices in your heart... Don't they hurt?"
Only then did Shi Yan discover that this pure and fragile mission target could actually hear the wails of all the dead souls deep in his heart - that was his unique "murder echo."
Salvation becomes an apology for one's own sins. The boy's existence becomes more transparent due to his killing. In the end, the manager makes a cruel choice: trade the rest of your blank life for the continuation of his existence.
Shi Yan tightened his grip on the knife, but showed his first "human" smile.
"No."
"I bear my sins myself. His existence is protected by me."
From then on, the most dangerous assassin in the abyss has a young man who can listen to the echoes of all things. They have become symbiotic legends wandering in endless purgatory - one carries all the blood, the other purifies all the cries, and writes the only echo in the abyss of sin and redemption.
