How far is it for Korean teachers to be online in 4 million dollars a year?

Megastudy is South Korea's most representative online education site, due to high partitioning, resulting in a group of millions of million, tens of thousands of star teachers, including (transliteration Kim Ki-hoon) last year income of up to 4 million U.S. dollars. According to the Lianhe Zaobao, has been teaching for more than 20 years, and he is a very diligent person who works 60 hours a week, 3 hours in the network, and other time online to answer questions and prepare lessons, so his main income also comes from the Internet. Kim's online course costs 4 dollars an hour, and 150,000 students visit his online class every year, mainly middle school students. has become a famous personal brand in Korea's education and training market, and he has written as many as 200 supplementary books, all of which are published by own publishers. According to research firm NPD Group, nearly three-fourths South Korean students receive private tuition, and last year South Korea spent more than 17 billion dollars on tuition. Some traditional institutions in the country also want to draw on the Megastudy star teacher route, such as learning and thinking school, it is said that teachers have received millions other income.