Melbourne is typically 2 hours ahead of Seoul. When it's 12:00 PM in Melbourne, it's 10:00 AM in Seoul. South Korea does not observe daylight saving time, but Melbourne does.
During Australian daylight saving time (October to April), the difference is 2 hours. During Australian standard time (April to October), the difference is only 1 hour.
Excellent business hour overlap! 9:00 AM - 5:00 PM Melbourne is 7:00 AM - 3:00 PM Seoul (or 8:00 AM - 4:00 PM in winter). Almost full overlap during Korean business hours.
K-pop and Korean culture are hugely popular in Australia. Melbourne has a thriving Korean community, and direct flights connect the cities in about 10 hours.