>>7649694 (OP) For the lines? Its just the same brush but the sketch is lower opacity than the "lines" and he didn't delete the sketch after. Looks like a charcoal pencil brush to me, maybe triangle tipped.
The only reason I am commenting is simply to mention that I read the original comics on Webtoon. I have no interest in that story or site anymore but, it brought back a nice memory. Thank you