Our story quietly opens at the dawn of the thirtieth century, a new era forged by the hammer of history. The earth, once a bright blue planet, is now scarred by war. The embers of nuclear winter turn to desert. However, humans did not give up. Beneath an oasis in central Australia, a magnificent underground city has been built - City of Hope. This underground city is the crystallization of human ingenuity and tenacity, the sunlight shines through the high-tech dome, and the green plants grow stubbornly along the streets, as if symbolizing the last stubbornness of nature. After 600 years of restoration, the surface is gradually coming back to life, but technological progress has been slow. Until a group of mysterious alien visitors - the Zeretas - show up, bringing advanced technology and restarting the rise of humanity. However, there are more mysteries behind this rebirth. Alex Carter's family has been secretly chosen to protect the historic site. However, Alex knew nothing about all this. A chance discovery uncovers his family's secrets and sets him on a fateful journey full of adventure and responsibility.