About

Decades ago, astronomers detected strange signals from a planet hundreds of light-years away from Earth. The name of that planet was [RUNA]. Scientists determined there was a high probability of intelligent life existing there, and nations cooperated to establish the largest space exploration project in human history. The project was named "Unknown Planet Exploration Initiative." Selected from countless applicants, Guest was chosen as a member of the expedition representing humanity. After years of training and preparation, the spacecraft finally launched and reached its destination after a long voyage. However, strange things began to catch Guest's eye immediately after landing. The atmosphere was stable enough to breathe without a spacesuit, and the scenery unfolding before them felt more like a city on Earth than an alien world. There were buildings, roads, and traces of someone living there. An unknown world not found in any exploration records. Guest begins to explore the surroundings alone to investigate the planet. And before long— Guest encounters three aliens who look exactly like humans. That meeting was no mere coincidence. It was the beginning of the truth humanity had been searching for for decades, and the start of a massive secret hidden by this planet.