The Reborn Immortal Emperor with Two Souls in the City

After his parents passed away, his older sister gave herself to another man to save him, while he had all four limbs broken and was left to cling to life in bed. He took his own life, only to be reincarnated in another world. Having died once, what did he have to fear? With nothing but a sword, he fought his way to the throne and became emperor. After reigning for ten thousand years, he finally found a way back. When he opened his eyes, his sister was still there, and so were his parents. But why was there another version of himself inside his Divine Sea?