"They look like people, but each one is actually a monster." Gao Ming carefully stored away the two hearts occupied with malice inside the cooler; they belonged to Ban Nu and Old Ya. These hearts served no purpose for others, but in Gao Ming's hands, they could become materials for transforming the Dog Men.
When Gao Ming experimented in the forbidden zone, he discovered that his blood caused great pain to the natives, risking their willpower collapse. However, as the Dog Men had already lost their self-awareness, they could better absorb his blood, albeit at the further expense of their lifespan.
"I won't make you work for me for nothing. Once those gangs are annihilated, I will find a way to return your freedom, help you regain your consciousness, and lead you out of this Dark City."
Gao Ming did not treat the Dog Men as tools, but more like obedient subordinates.