Magician has been released weekly on Naver since 2007 and Line Webtoons since 2014. It is currently comprised of three seasons. The ongoing webtoon is released Wednesday on Naver and the official English version is released Sunday on Line Webtoons.
Feel free to check out the Korean version at Naver.com and also support the official English translations at LINE Webtoon by either downloading the app or reading it at the webpage. Both sources does not require any registration, and above all, it's free of charge.
This is a list of all chapters, for a list of just the story arcs click here.