If equipped with plate, it is shining to reflect the surrounding light and In the remake ver, It's emit light itself in the dark Music Appreciation Room.
After Defeating the ghost of the Music Appreciation Room, copper mirror is broken but the remake ver, it doesn't break or not used because it isn't a Cupper mirror.
- 음양 is a Yin-Yang in Korean.
- In the remake ver, Korean name of this item didn't change. < Plate Taegeuk ( 태극패 ) >
- In the remake ver, Unusual phenomena related to token is written in document : Investigation on The Yin-Yang Token (2)