Hello.
Today, I'm sharing some free information that I learned while studying ebook production. 
 

The book 'Ebook Guide for Publishers' is currently being distributed for free. The content is more substantial than you might think. It also introduces a simple way to create an ebook. If you are a small publisher or a one-person publisher and are considering ebook production, this is a book worth reading. It explains in detail the ebook copyright, ebook distribution methods, distribution company websites and contact information, and settlement methods. You can download it from your usual online bookstore and read it through an ebook viewer program. Here, I will provide links to the most representative YES24 and Aladdin.
 

[eBook] Ebook Guide for Publishers 
epub Korean Publishers Association issued (Author) Korean Publishers Association 2018-03-09  

https://www.yes24.com/Product/Goods/59225892?OzSrank=1

https://www.aladin.co.kr/shop/wproduct.aspx?ItemId=136851444

Next, here is a free resource on font file copyright. 

https://www.kogl.or.kr/recommend/recommendDivList.do?division=font&smallCode=freeFont

The Safe Font File Service has collected fonts that can be used freely without copyright concerns. 

 
Next is the [Font File Copyright Guide PDF] published by the Ministry of Culture, Sports and Tourism and the Korea Copyright Commission. The download link is as follows.
https://www.copyright.or.kr/information-materials/publication/research-report/view.do?brdctsno=43622

Check out the article below! 

I used free fonts, but it's copyright infringement 2022.03.29ㆍ by Boss Legal Theater

https://www.tosspayments.com/blog/articles/legal2-2

I hope this will be helpful for your ebook production and font use.
Thank you.