I don't know about houses and property but many restaurants/bars/businesses that cater to Koreans tend to be quite noticably more expensive than other businesses in the area selling the exact same product.
I think Jack was saying you shouldn't mention that you will be buying the lot to build a second house. Many Filipino will likely never own one house.
You should avoid showing up with anyone or saying anything that may make the property owner feel that you have more money than you need.