The Strongest Prodigal Son-In-Law

Qin Feng was the most useless son-in-law of the Lin family until he activated the causal investment system. Every time he "spends money", he is investing in the strong ones in the future. When the world laughed at him, the homeless man he invested in became a god of martial arts, and the down-and-out craftsman became a master craftsman. It wasn't until the crisis of world destruction came that everyone was shocked to realize that his prodigality had already bought the world's only way to survive.