When Angels Sin

There were countless angels in the celestial realm, created for a single sacred purpose. No angel strayed from the role they were created to fulfill. One task. One divine function. One eternal truth. From the moment of their creation until the last day of the universe.
Angels weren't humans.
They didn't feel, they didn't want, they didn't wonder. Angels did not dream of the future or mourn the past. They were perfect machines of light-divinely robotic, eternally still.

Until something cracked. No one knew why, no one knew how.

One angel moved.
His head lifted-barely-turning to glance at the angel beside him. Blonde hair met glowing halo. And then, the unthinkable, that angel looked back.
Their eyes met-just for a second. But it was enough.
Something unfamiliar surged within them. A ripple, a pulse. And in that heartbeat, the heavens shuddered.

Or,
Angels who sin, are stripped from the heavens grace and banished to hell.
but no one would have thought there's a way worse place to get exiled than hell.
and that place is Earth.
now Hyunjin is separated from his angel, and he doesn't know how to reach him.