Urban High Martial Arts: Spiritual qi revival, humanity evolves. Earth is one of the nurseries that was "seeded."
Interstellar Sci-Fi: Humanity ventures into the sea of stars and encounters civilizations. There is more than one nursery, and humanity is merely a "specimen."
The Myriad Races of the Starry Sky: The universe is crowded with countless races. All races are both "harvesters" and "the harvested"; the universe itself is a selection process.
Central mystery: The spiritual qi revival is not a natural phenomenon. It is the activation of an automated program left behind by an ancient civilization, the "Seeders." Humanity on Earth is the last specimen that has not been harvested.