Programmer Qi Yue received an invitation from the mysterious organization "Threshold Eye" and learned that his missing brother Qi Feng might be trapped in a different space called the "Back Room". This parallel dimension composed of countless weird levels is filled with environments that violate the laws of physics and bloodthirsty unknown entities:
Level 0 yellow maze erodes sanity
There is a monster in a suit lurking in the Level 4 office who forces people to "party"
Level 7's underwater base hides the truth about human body modification experiments
Level 9's perfect community can tamper with memories and make people voluntarily become prisoners...
In order to find his brother, Qi Yue went deep into the back room and soon discovered that all this was related to his father's secret research during his lifetime. The "liminal eyes" are not explorers of the back room, but manipulators - they try to use this space to transform human consciousness.
As he went deeper, Qi Yue found clues left by his brother in the cracks in the wall, the recordings and the bloody words:
"The back room is alive and it's eating our anger."
"Don't trust anyone who claims to be your father."
"If you see me become inhuman... Please kill me."
When Qi Yue finally approaches the core of the back room, he must make a choice: destroy this alien space that swallows countless lives, or take over his father's unfinished crazy plan?
And the most terrifying truth is that his brother may have already
