Looks like Reddit was on the case 6 years ago. I’m not going to link to the thread, and just dump the relevant bits instead. Most of the links appear dead anyway.

From reddit:

So it comes from a webcomic series of short gags with the title: “심심할때 그려보는 K군의 조금이상한 두컷만하”

(edit: correction of 페 per Keppay)

Edit: artist’s gallery www.cyworld.com/kbk74 browse back far enough to 2005-06

edit: kjoonlee put the artist name down as 고병규 or “Byeong-Kyu Ko” and google brings up a profile for him:

namu.wiki/w/고병규

Google Translated says that he went into mobile game dev as as a founding member / director of Flint (who developed Dragon Blaze)

more examples of his work here in published comics m.blog.naver.com/PostView.nhn?blogId=realnogun&lo…