The only thing he did was watch people die in grief. He says, "Life is just a caricature of exceptional platitude except a few punching smiles."
David is a young man who decides to live in solitude at a very young age. A few years later the solitude with absolute void acceptance of a few repeated thoughts make him enter a mansion with great valuables and no life. He gets to know about the things he didn't know, and then the actions of presence make him enter into the state of actions. A few punching smiles that he talks about are the gain of his life in the mansion.