Hi Kimchiqueen,
I currently teach Society and Culture and it is worrying that you haven'r "started" the writing of your PIP - however - glad that you have at least a research focus. At the moment, you really need to CRAM and work really hard over the school holidays on your PIP.
If I were you, I would:
1) Perform some secondary research using Google Scholar and find some books/articles on mental health/illness. You could even perform a content analysis on media articles in the news showcasing mental health issues in both Korean and Australian contexts (therefore being able to perform a cross-cultural analysis)
2) Develop some primary methodologies (such as a questionnaire, focus group, and interviews - possibly integrating this into Korean communities, or interviewing someone from Korea (or even better - a specialist or psychologist who might have dealt with mental health/Korean issues).
3) Write Write Write. Check the sample PIPS in the State Library and/nor ARC for further information.
Also - your hypothesis is your "argument" or what you a seeking out to prove - in this case - you could hypothesise that the cultural acceptance of mental illness is greater in Western (Australian societies) rather than in Korean culture due to .... (cultural issues/etc...)
Good luck.