What I turned in was an alien fragment.
On the day I picked up the fragment, the system told me: My mother is 4.2 Light years away.
The overturned tea table in the Chen Family Ancestral Hall, the black wing mark in the secret compartment of the warehouse in the west of the city, and a door fifty-three meters underground that had been sealed for twelve years.
The day my mother disappeared, she drew an unfinished circle on my window glass.
The system said: That circle points 4.2 Light years away.
Four years later, the Iron Wall system was installed in eighteen provinces with zero casualties. I received a reply from four light years away.
There are only three words in the reply: Waiting for you to come.
It took me eight years to get to her.
But there was a second person looking at me outside that window.