On the other side of the rift in the universe, a planet named 423 has long been destroyed.
Its legacy fell across the sea of stars to the earth - an energy called "ether", a set of equipment system called "key", and a history deliberately concealed by the alliance: all our power comes from the destroyed civilization.
Young Yuhang picked up a memory key in the ruins, and from then on he could see the flow of ether. He thought it was a gift from fate, but he didn't know that every time he used power, it was being penetrated, eroded, and rewritten by the ether - until he couldn't tell whether he was still his original self.
In the western desert, Fei Cai and Yinyue woke up with the memories of another planet, and found that the entire world's energy system was built on the corpses of their hometown. They want to go home, but the way home passes through the abyss of ether, and at the end of the abyss lies something more terrifying than death - the truth.
Concept: The essence of power is price - every time you become stronger, you consume the "human" part. The real strength is not to gain something, but to dare to give up.