Do i have to extend my expired date of passport?

Hellow. I am Andrew and from South Korea. I have a passport which is available 31/DEC/2012.
I would like to visit Hon Kong at the end of Jun and travel about 2~3 days. After that I`ll go back to Korea.
I was told that when I visit other counties, the expired date of passport has to ramaim more than 6months.
I am wondering wheather I can visit to Honk Kong on 28/Jun/2012 till 2/July/2012 or not with my present passport?
If I am not able to visit to Hong Kong with my present passport, could let me konw which day is available to visit to Hong Kong with my passport?
Thanks!