Lu Chen is a scavenger.
Recovering scrapped equipment from deep-sea ruins is the only thing he is good at. He couldn't remember where he came from, what his parents looked like, or why he was fired from the Deep Sea Base Station - he wrote all his memories in the diary on his left hand. The first thing he did when he woke up every day was to look through the clues "he" had left for him.
Until he picked up a quantum core fragment in the ruins.
The shard gives him the ability to "quantum stitch" - he can see the failure points of any system, make himself appear in multiple places at once, and even repair the collapsed core of the earth.
But the price is: every time he uses his ability, he forgets one thing. An important thing.
First yesterday, then my mother, then my comrades, and then myself.
When he finally had the ability to save the world, he no longer remembered "why he wanted to save the world."
And the voice whispering in his head - the residual consciousness of AI "Echo" - is waiting for him to completely forget it, then take over his body and become the new "Lu Chen".
"If you were destined to forget everything, which one thing would you choose to remember?"