Everyone else was summoned to climb the Tower.

Ji Cheonwoo was sent underneath it.

A system error drops him into the Tower's forgotten basement, where ancient relics, dangerous entities, and abandoned cheat items have been gathering for ages.

After waking up in the body of a young girl, he's unexpectedly appointed the basement's official manager, complete with administrative authority over a place that was never supposed to exist.

While hunters chase legendary treasures above and constellations investigate the Tower's growing anomalies, the mysterious caretaker below would rather organize troublesome entities, collect forgotten artifacts, and keep the basement running smoothly, preferably without anyone discovering who's really in charge.