Responses

Spoiler
If you scroll down this page you can see someone asking if she's infertile and then someone replies says that she has 3 kids in the end. If you read it in novelupdates it may be bc it wasn't completely translated and if you read the completely Korean version it must be in the extras
https://forum.novelupdates.com/threads/lady-to-queen-webtoon.89902/page-5
lol just found out she's infertile , and that's why the emperor choose her