초등학교 졸업사진에 주민등록번호가 적혀 있기도 했고, 유명 가수 앨범 뒷면엔 가수 이름과 함께 주민등록번호가 기재됐다.
The resident registration number was written on the graduation photo of the elementary school, and the resident registration number was written along with the singer's name on the back of the famous singer's album.