To prevent ecological catastrophes led by overdevelopment, humanity on Earth initiated large-scaled interplanetary migration plans to save their kind. After 500 years of effort, the first humans have successfully landed on Kepler-1649c in the constellation of Cygnus and had established a colonial government, accomplishing the first-ever feat of large-scaled galactic migration, allowing humanity to celebrate the first year of the Cosmic Era.
In year 210 of the Cosmic Era, an erroneous biotechnological experiment carried out by the colonial government caused irreversible damage to the ecosystem of Kepler-1649c, resulting in grave environmental pollution of the planet's surface, forcing survivors of the calamity to move underground due to unhabitable conditions, thus unfolding the events of the Underground Era, lasting centuries to come.
In the gloomy subterranean life of the Underground Era, limited resources had fallen to become the government's means to solidify their control over the people. As the underground economy deteriorates over time, the corrupted regime tightens its grip over the people's thoughts and liberty to bury its past mistakes, banning all information regarding the planet's surface and treating it as strictly prohibited areas. As centuries passed, underground dwellers have grown unaware of the past homes in which their ancestors resided. What used to be humanity's most celebrated breakthrough has now become forbidden unorthodoxy, silently waiting for rebellious individuals to uncover the long-lost history of the Cosmic Era......
INTO THE MOUNTAIN TRAIL
Japanese actor Shohei Matsuzaki treads into the jade-green trails of the Yangmingshan National Park.
BEHIND THE SCENE
Live shoot recoding of Season 2