Libya is about 18 times bigger than South Korea.

South Korea is approximately 99,720 sq km, while Libya is approximately 1,759,540 sq km, making Libya 1,664% larger than South Korea. Meanwhile, the population of South Korea is ~51.8 million people (44.7 million fewer people live in Libya).
Tip: This to-scale comparison of South Korea vs. Libya uses the Mercator projection, which distorts the size of regions near the poles.