It was Roi who spent one million yen to buy his own patent and helped venture capitalist (Fan Wei) tide over the economic crisis. Roi said that seeing the future means looking forward to a better future, which is also an encouragement to everyone who is experiencing the global economic crisis.
Personally, I think Sang Wu's crying is moved by his friendship with Roi, and it is also his helplessness and sadness as a middle-aged man and lonely in Japan.