From U.S. stocks to the metaverse and cryptocurrency! A story about money and investing, told by three economics YouTubers. "Save Us, Kakao Friends! Economy Book 3" is an educational comic that covers essential economic knowledge for today's world, including U.S. stocks, the 4th Industrial Revolution, and digital finance. It connects the "real economy" and the concept of "future wealth" — topics not usually taught in school — with social studies curriculum, presenting them in a way that's easy for children to understand. As kids join the Kakao Friends on an exciting adventure through the book, they'll come away with 62 key economic keywords in their minds and a healthy, solid investment mindset in their hearts. When it comes to learning about economics, the earlier you start, the better prepared you'll be. Lead the future economy on a global stage! 1. U.S. Stocks — Look beyond your own country to see new flows of wealth! We live in an era where understanding the flow and value of money that moves the world is more important than ever. Learning about the U.S. stock market — the largest in the world, where global money and companies converge — is essential knowledge for understanding the global economy. 2. The 4th Industrial Revolution — Get a glimpse of the future of wealth shaped by new technology! Children growing up in an age of artificial intelligence, competing alongside robots, need to understand technological innovations like AI and big data. Only then can they predict where wealth will concentrate and proactively prepare for the flow of money. 3. Digital Finance — Learn the concepts of cryptocurrency, from blockchain to Bitcoin! For a generation raised on digital technology, digital assets represent the closest opportunity for building wealth. Understanding the latest trends in economics and finance helps children naturally develop an economic mindset from an early age.