Elias sat under the green leaves, the only person in the world who knew that at the heart of Level 485, the old world was still breathing.

He soon realized these weren't just coordinates for his floor—they were a code. By inputting the numbers into the sector’s ancient ventilation override, Elias discovered a hidden "pocket" between the steel layers of the world. Inside wasn't more machinery, but a preserved glass biodome containing a single, ancient oak tree—the last of its kind.

Elias lived on Level , a transitional zone suspended between the smog-choked industrial "Roots" below and the sun-drenched "Crown" above. Level 485 was the level of the Fixers. It was a place of constant humming machinery, neon-lit repair shops, and the smell of ozone and rain.

In the year 2485, Earth was no longer a planet of continents, but a planet of levels.

One Tuesday, Elias found a relic in a junk pile: an ancient, brass-keyed typewriter. On its carriage was a stuck piece of yellowed paper with three numbers typed over and over: .