Best Korean clinics for melasma and hyperpigmentation treatment?

I developed melasma after pregnancy and it has not faded even after 2 years. I have tried many over-the-counter products and even prescription creams but nothing has worked. I have heard that Korean dermatologists have advanced techniques for treating stubborn pigmentation. Has anyone successfully treated melasma or hyperpigmentation in Korea? What treatments did you receive? How many sessions did it take? Did the pigmentation come back? I need to find a solution because this has really affected my confidence. Any clinic recommendations and realistic expectations would be appreciated.