It is a pen that writes sound effects. 효과음을 쓰는 펜입니다.
This pen is used to write sound effects. I think it's especially good when you use strong sound effects thickly. We recommend that you adjust it to your liking.
효과음을 쓰는 용도의 펜입니다. 특히 강한 효과음을 두껍게 쓸 때 좋다고 생각합니다. 취향껏 조절해 쓰시길 권장 드립니다.