In South Korea, mattress sizes follow specific standards that are somewhat different from international sizes. Here are the common mattress sizes in South Korea:

1. **Single (1인용)**: 99 cm x 195 cm (39" x 77")
2. **Super Single (슈퍼싱글)**: 120 cm x 195 cm (47" x 77")
3. **Double (더블)**: 140 cm x 195 cm (55" x 77")
4. **Queen (퀸)**: 152 cm x 195 cm (60" x 77")
5. **King (킹)**: 180 cm x 200 cm (71" x 79")

These sizes are approximate and can vary slightly between manufacturers. It's always a good idea to check the specific dimensions provided by the manufacturer or retailer when purchasing a mattress. Additionally, some retailers may offer custom sizes to fit specific needs or bed frames.

In South Korea, mattresses are often measured in centimeters, so it's important to double-check the dimensions to ensure the mattress fits your bed frame properly.