The Returner of Human Fire

He didn't know where Gu Shen would die. He didn't even know that what Gu Shen exchanged for his life was the birth of a machine consciousness named "Deep Blue". Dark blue carries 3.2 Billion memory slices of the deceased, silently guarding the fire of human civilization over the long years. After completing his mission, Chen Yuan did not return to the future - he chose to stay and became the first person to "water water" on the ruins.