Why does Soo-Ja want to by a parcel of land in Seoul's Gangnam neighborhood in the book, This Burns My Heart: A Novel?

Soo-Ja wants to by a parcel of land in Seoul's Gangnam neighborhood because the land is undeveloped and she hopes that sometime in the future the government will want to buy it to build more buildings or housing. Soo-Ja tries to get the money, but fails. In the end, Yul makes the purchase in her name and the investment pays off quickly, making Soo-Ja very rich.