As the children who were born after 2015 grow up, we are surprised to find that most of them don't have a clear understanding of how money works. They grew up in a cashless society which didn't give them a chance to understand the numbers printed on banknotes. In my childhood, our parents received a few banknotes as a salary every month. Each of these special papers represented what our parents had worked hard for in the month, this money was obtained in exchanged for their sweat. We spent this money carefully to maintain our family. However, children who live in a cashless society only know that they can buy anything by scanning a QR code on their phone. They don't know what the number on their phones represent. They even think that a smart phone can make as much money as they want. The relationship between money and sweat becomes unequal. So, I am concerned about these children’s attitude toward money. Sooner or later, they will be adults and begin to make money to support their family. As an old Chinese saying goes: frugalness is the base of keep a family thriving!