I am a 43-year-old single man. Please review my financial plan.

‌Looking at the people around me, they have high expectations for asset growth because they have to support a wife and children.
Since I will be living alone, I don't feel the need to go that far.
I think having 500 million KRW at retirement will be enough. I don't have much greed.
My current plan is to invest 20 million KRW annually in an ISA and 18 million KRW in a Pension Savings Fund into US index ETFs (focusing on Nasdaq).
Currently, I have extra emergency funds in a CMA, but I don't think I need to go as far as direct overseas investing.
If I max out my tax-advantaged accounts for the next 10 years, I think I can reach my target amount.
After retirement, I plan to create a cash flow through dividends and spend my old age traveling leisurely.