
I really wish there are more manhwa like this cuz it's so cute

If you haven't found this yet, you might enjoy it too: https://www.mangago.zone/read-manga/my_daddy_hides_his_power/
(It's so similar to this one, I get them confused sometimes lol)
Maybe the fake Saintess was the blond daughter of the duke that's why the high priest reaction was like that and why she went to imperial palace just a theory
Wasn't the setting that the Saintess will be Liz rival, isn't the duke daughter a bit too old for the crown prince? I don't really remember the beginning of the series, but all future events should be around Liz.