Place it over the moment a word is underlined or a diagram takes shape, then follow it with a bell ding once the answer is revealed. For a wrong answer, pair it with a classic error sound first so the correction stands out.
이 사운드에 대해
This is a six-second scrape of a felt-tip marker moving over paper, with dry friction, brief squeaks and soft scratching each time the tip turns. It feels tactile and oddly satisfying, like watching handwriting appear in real time, and it makes a simple underline or circled word feel deliberate and clear.