When I decided to improve my English, I was recommended to try
자세히 보기 for adults. At first, I was hesitant, because the classes were held via video link. But after the first lessons, I realized that this was my format: the teachers are native speakers, the approach is individual, and you can study from anywhere in the world. In a couple of months, I noticed how much my speaking skills and understanding of English improved. Online lessons really made the learning process convenient and effective for me.