On December 20, 2012, in a forgotten observatory on Earth, three gravitational wave detectors simultaneously captured a signal that did not belong to any known celestial body.
It is not a supernova explosion or a black hole merger. Its waveform is like a whisper, more like a thread pulling fate.
Billions of light-years away, three planets crowded into the same orbit - the gloomy winter yin, the indifferent spring and autumn breeze, and the hot summer clear - also felt this ripple at the same moment. Each of the three civilizations has its own secrets, and they share a taboo that has been sealed for two thousand years: a causal abyss called the "Gate of the Void".
The purple jurist Yang Zhiyu dug out an ancient agreement from ancient books that no one dared to sign; the green girl Qi Nanxu broke into her father's secret room and met an amnesiac visitor from the earth; the red boy Yang Shixu discovered that his bloodline was silently resonating with an ancient symbol. And that symbol points to a blank place on the star map - a blue planet that humans call home.
They didn't know what was staring behind that door.
They don't even know that the lead extending from the depths of the star abyss affects not one person's fate, but two worlds and two thousand years of reincarnation.
The door is open, don't look back.
But the price of looking back is the survival of the entire civilization.
