http://kid.chosun.com/site/data/html_dir/2018/01/15/2018011502093.html

https://imnews.imbc.com/news/2018/culture/article/4493692_30819.html

https://www.edaily.co.kr/news/read?newsId=01085686616161800&mediaCodeNo=257&OutLnkChk=Y

http://news.heraldcorp.com/view.php?ud=20171223000046

https://www.segye.com/newsView/20171126002212

https://www.kocca.kr/n_content/vol03/vol03_05.pdf

https://www.youtube.com/watch?v=w7zDKXdXVJs