We are a newlywed couple, but we are worried about housing...

We own one apartment currently undergoing reconstruction with a 25-pyeong occupancy right.
The additional contribution (levy) is 400 million KRW.
We have 200 million KRW in stocks.
After paying a 10 million KRW monthly rent deposit, wedding costs, and postpartum care center fees due to pregnancy, etc.,
the remaining cash is about 5 million KRW...
Monthly rent is 700,000 KRW.
Monthly salary is about 3.2 million KRW.
For now, it is a single-income household (civil servant).
If we leave the stocks and the apartment as they are, this is our situation.
Am I being too greedy?