Board Thread:General Discussion/@comment-27973430-20200508203032/@comment-29927487-20200508210910

The original source doesn't work, but it is said they were daughters. The translation of the blog made a mistake and called them sons.

https://web.archive.org/web/20160209080336/http://inutero3334.blog.me/140125436243 Here it says "two sister"

(자매)