Wang Wei asked himself: how did he acquire the title or position of Fate Seed? The logical answer is Grand Dao, or the River of Fate, saw his personality and desires after he reincarnated into this world and gave him the position.
There is even a high possibility he became a Fate Seed once he was in the void, trying to survive by swallowing these purple orbs, meaning someone or something had determined his life and destiny eons ago.
'However, what if things were worse than I anticipated,' thought Wang Wei, looking at the world through complete malice. 'What if I was a Fate Seed ever since I was a mortal on Earth? What would be the implications behind this notion if it were true?'
Despite how horrifying this theory was, he calmed down to ponder the significance behind this possibility.