I think the first half of the first character (the "initial") is definitely the stroke for "K" looking like the number 7, and the entire first character could be kaeng (갱) with the "ae" and "ng" parts squished together, the ellipse/ring for "ng" looking like a little blob and the two "horns" of "ae" just above that barely discernible (of course, there are other vowels that look like horns too). The next character is washed out, then there may be a gap since Hangul characters are not so flat as to blend with the horizontal underline, the last two blobs could be numbers like 8, 0, 6, or 9. This is the best I could do.