If you save 300,000 won a month, there is a way to live by spending 3 million won (before tax) every month until you die.
You might think you need to save 2 to 3 million won per month to prepare for retirement, but you can easily prepare for retirement by starting with around 300,000 won per month.
You say that's nonsense? This book explains in detail how working people can sufficiently prepare for retirement with just 300,000 won per month.
All you need to prepare are four things: a pension savings account (using securities) that office workers pay into for year-end tax deductions, 300,000 won per month, about 2 minutes of time per month, and the will to 'prepare for retirement'.

---From the "Prologue"

Even in these bleak times of rising inflation and interest rates, where everything but wages is rising, you might wonder whether pension planning is still effective.
But this method has already been proven in history.
This method was effective during the dot-com bubble in the US, the 2008 subprime mortgage crisis when major US financial institutions went bankrupt one after another and dollar assets were said to be worthless, the stock market crash caused by the 2020 coronavirus pandemic, and even during the outbreak of World War II.
Despite growing concerns about the prospect of continued interest rate hikes and the resulting "worst-ever economic downturn," this strategy is largely unaffected by the current situation.
For ordinary people like us who are preparing for retirement, a bear market can actually be an opportunity.
Whether the economy is doing well or not, as long as humanity doesn't go extinct, the economy will keep turning, and for those of us who invest for the long term, this presents a good opportunity to buy at a low price.

---From the "Prologue"

If you save 300,000 won a month for retirement and get this level of output, isn't that worth it? If you save 300,000 won a month for 30 years, your principal will be 108 million won (of course, 100 million won is a lot of money). If you invest that money in a US S&P 500 ETF from your retirement savings account, you'll be able to live off 2.64 million won a month in your retirement.
Of course, 2.64 million won per month may not be enough to completely free yourself from money after 30 years, but with just this amount of effort each month, you can prepare well for retirement without having to save billions of won.
---From "Chapter 1 Pension Savings, This is a Crazy Product"

No matter how great the S&P 500 is and how it is synonymous with upward trends, as can be seen in the following stock price graph, stocks fluctuate considerably up and down due to their nature.
Thanks to the S&P 500's significant rise over the past decade, everyone says that the "US stock market is on the rise," but in reality, the US S&P 500 has a history of being stuck in a box for over 10 years, unable to break out of its all-time high.
As such, the S&P 500 ETF is a stock and thus a highly volatile investment asset.
Therefore, depending on the investment timing and investment period, you may end up with an unwanted negative return.
In fact, at any given point in time, if you invest in the S&P 500 for a month, there is a 39.3% chance that it will be negative.
However, as shown in the graph in the next chapter, the longer the investment period, the lower the probability of losing money. If you invest for 20 years, the probability drops to 0.1% regardless of when you invest.
In fact, you will reach a point where you cannot lose money even if you want to.

---From "Investment Setting Method Starting with 300,000 Won a Month"