Talk:Vol.2 Ch.235: 43F - Hell Train: The Floor of Death (4)/@comment-25346948-20170129181835/@comment-26484417-20170130080633

I can think of two fairly likely explanations for this that do not contradict anything we have seen in the story:  The statement has implicitly accounted for the unique circumstances of the Yeon Family. In other words, being born to Illarde is as direct descent as it could be (i.e., Hana is out of the picture in this regard), so it is considered as such. It's possible that SIU changed some parts of the setting and retained other. Namely, it could be that Hana is now Yihwa's birth mother (i.e., the whole chastity / virgin thing was scrapped), while Illarde is still the one who raised her. 