Link: http://www.arirang.co.kr/News/News_View.asp?nseq=224744
Link: https://mainichi.jp/english/articles/20181012/p2g/00m/0dm/012000c
Link: http://khnews.kheraldm.com/view.php?ud=20181011000859&md=20181012003008_BL
Link: http://www.koreatimes.co.kr/www/nation/2018/10/177_256900.html