The Korean language may or may not have such great significance as Chinese or Japanese, however, the reasons for learning it do not decrease from this:
Learning Korean will help you to expand by reaching 78 million people. This is an approximate number of Korean speakers.
Knowing the language will help you learn more about Korean culture, traditions and lifestyle.
If you like to travel or are going to visit Korea, knowledge of the language is very useful, because many people do not speak English, and traveling around the country will be difficult You can work for Korean companies and knowledge of the Korean language is a prerequisite for a successful career.
The Korean government offers a variety of grants and various financial assistance for those wishing to study in their country. And being in the country will speed up your learning process.