We earn 250 million KRW combined; please advise on investment strategies

‌I am in my mid-to-late 30s, and my wife is in her early 30s.
We don't have children yet. Both my wife and I are professionals in liberal arts fields; I have my own practice, and my wife works for a corporation.
Our combined annual income is 250 million KRW after tax, but our total combined savings amount to about 200 million KRW.
We are currently living in a monthly rental villa. We are planning to have children in two years.
Our biggest concern lately is investment management. We have both focused solely on our studies, and since I started studying finance late, we don't know much about it.
All we know regarding investments is steadily accumulating S&P500 index funds and housing subscription accounts.
I would be grateful if you could provide an outline of how we should manage our money moving forward.