중봉운필을 위한 붓 사용법과 먹물을 벼루에서 어떻게 찍는가?

This is a video from a lecture on the Hanja Regular Script, specifically the "Guseonggungyecheonmyeong" style. It explains the method for producing a square brush stroke and, around the middle of the video, how to apply ink from the inkstone to the brush. This is truly important, yet it seems there are no other places teaching it. Please do not miss this; if you watch it and put it into practice, it is very effective for mastering the central brush stroke technique. In fact, it is essential.