I recommend Ilsan Made Yoo Clinic Dermatology.

Made You Clinic Ilsan Branch is located right in front of Exit 1 of Jeongbalsan Station. They have a family medicine specialist on staff.

They are excellent at removing freckles and dark spots, and the staff are friendly and provide thorough explanations. Many of their reviews say the treatment was very effective.

Please check out the reviews. There are a lot of really good ones.

It's a place with clean facilities, friendly staff, and reasonable prices.