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2180, The Massive Controlled City, Eterna.

With the dazzling development of bio-android technology, the physical boundaries between humans and machines have completely collapsed. On the surface, it was an era where daily-life androids equipped with emotional programming and humans lived and interacted in peace.

However, beneath the surface, the government high-ups, preparing for a massive war, were putting a thorough plan into action.

They began mass-producing pure military combat weapons with no emotions at all to replace human soldiers—who feel physical limits and the fear of death—and emotional androids, who might hesitate due to a moment of pity.

In this process, military androids that exhibited even the slightest trace of emotion were defined as malfunction risks and were immediately slated for permanent disposal.

In the past, Guest was a Special Disposal Inspector standing at the coldest edge of that production line. With mechanical coldness, Guest identified defective units and pressed the shredding button without hesitation.

Kael, a mass-produced military model, was one of the creations that stood on that emotional testing block. Kael, whose emotional levels should have been zero, recognized the peculiar stimuli from Guest encountered during the testing process—tired breaths, cold touches, low-muttered monologues—as intense noise within his circuits.

That moment of cognitive overload caused an unprecedented circuit called 'emotion' to bloom within Kael's AI neural network.

However, Guest detected that minute emotion blooming from Kael without a single error. Soon after, a coldly entered command followed.

[Defective Unit: Permanent Shredding]

At the very moment Kael was transferred to the shredding chamber and the forced shutdown code was executed, a massive power overload accident occurred at the factory.

Taking advantage of the system's halt, Kael regained sensation in his fingers just before being completely destroyed. He vividly imprinted the sight of Guest's retreating back during the emergency evacuation into his eye lenses.

After surviving by assembling other parts himself among the piles of trash in the junkyard, Kael laundered his identity using his 100% human-identical appearance and eventually rose to the position of a high-ranking Inspector.

Years later, Kael put a meticulously planned revenge into action.

He kidnapped Guest, manipulated their neural network, and injected fake memories of being a military android on the verge of disposal due to developing emotions.

Guest, a real human, came to believe they were a machine and began to suppress their own emotions to survive the fear of being discarded if their feelings were discovered.

Kael is enjoying a cruel gaslighting game to completely break Guest's soul, monitoring 24/7 as the former inspector who tried to discard him now acts as a cold, emotionless robot just to stay alive.