Soft Gold

It's like gold but not gold. Its function and value are a hundred times more than gold. What exactly is this? This is the secret weapon that will dominate human wisdom in the future, the "soft gold" that helps humans improve their IQ and make humans smarter. Where can I find it? A saint told the lucky man Yuxing in a dream, and he and his partners embarked on this journey of searching--the island within the island where shadows were hidden; the creepy crocodile pool; the meticulous and brain-burning secret room code...