Serae Kim is the author of the Magician series.
His blog can be found at http://blog.naver.com/santha
Serae Kim is an Korean male. He wears glasses.
He shows a photo of himself in the first bonus chapter, Chapter 38.5 with his eyes censored.
Also in first bonus chapter, he also shows a personification of himself as a circle with arms and strings of hair.
His self-representation changes over the course of the bonus chapters.
In a later bonus chapter, Chapter 162.5, he sketches himself while interacting with Magician characters.