Three years after the nuclear winter, mankind barely survives relying on the backroom space-time door opened by A-SYNC Corporation.
Feng Changjiang, an ordinary decoration worker, paints walls and repairs pipes at the entrance level 0 of the back room every day. He never thought that he would become a player in this strange world.
When the tentacles drag colleagues toward the red door, when the shadows in nightmares appear in reality, when the cold electronic sound announces "target digitalization lock"——
His life changed completely from the moment he opened the red door.
Back room systems, KV-31 plans, digitized bodies, countless movie world missions...
What secret is hidden behind all this?
And why was he chosen?
If it were you, would you choose the red door or the blue door?
