Serious version: He has walked the world alone for thousands of years, passed by the sun, moon and stars, and crossed thousands of miles of mountains and rivers, just to find the answer to his own mystery. He wondered why he was the only immortal in the world; he lamented why everyone he loved had been lost.
Sand sculpture version: Qi Buyu is this person, greedy for money and lustful (hungry); not knowledgeable and talented (after living for so many years, he can't be an idiot no matter what he does)