Silence and Redemption

In the abyss of darkness, the claws of evil stretch out wantonly. A group of children abandoned by fate, who should have been laughing in the sun, were kidnapped by a mysterious organization to a dark base and turned into "tools" trained by killers. In this dark prison. They have gone through cruel training with hot and cold weapons, medicine, anatomy, computers, etc., And every step is stained with blood. Should he succumb to the darkness and become a killing machine, or break through the shackles and find the light of humanity? They choose between blood and tears, wandering between life and death, and what awaits them is the dawn of light or the endless abyss of darkness? What secrets are ultimately hidden in one mission after another? Who is planning? Who is taking revenge? Who is on the road to redeem themselves?