I finally saved 100 million won last year. I was just an ordinary office worker earning 3 million won a month. The method was simple: 1) Save 50% unconditionally (1.5 million won per month), 2) Invest in stocks mainly through ETFs for the long term, 3) Earn an additional 300,000 to 500,000 won per month through side projects. In particular, I diversified my ETF investments into KOSPI 200 and S&P 500. Of course, it was tough cutting living expenses to the extreme, but achieving the goal feels rewarding. Feel free to ask questions if you have any financial tips concerns!