@lumpychicken basing on Mao's assumption, the baby-swap was later discovered and her foster father was punished because he failed to notice the swap. So some high ranking people should know of this. But I bet they don't know the identity of the crown prince even of they knew the swapping.
I love how Ahin is so understanding and perceptive to the people around her. And the way she responds to problems, really 10/10. Is this really a manhwa lol ('cause the ones I usually find are overly sweet without plot and are overly dramatic without a reason). This one is a rare find, wish...