Filler options in Korea - what lasts longest for nasolabial folds?

I am 35 and developing noticeable nasolabial folds (laugh lines). I had filler once in my home country but it only lasted about 6 months. I have heard that Korean clinics offer a wider variety of filler options. What types of fillers are commonly used in Korea for nasolabial folds? Are there fillers that last longer than the typical 6-12 months? I am looking for something semi-permanent but not permanent (I do not want complications). Also, how do Korean prices for filler compare to Western prices? Any specific brand recommendations?