I don't really get it. They're mentally 25+ years old at this point....So why do they often react like they're small children? Lets run away tonight? Really? In the bodies of small children? Where do they think they're going to go? Being cared for as a whim in their eyes or not, they're not being actively threatened, and even if they are so weary of the emperor, their other siblings have been nothing if not doting on them. At least have a plan other than sneaking out with nothing but the clothes on your back. Maybe even wait a few years until you are physically capable of taking care of yourselves. Hide some money, figure it out. Take care of yourselves! Jesus, consider the harm you're putting your twin in rashly trying to run away. You're basically in a medieval style world with very recognizable features, this ain't like a couple kids running around Seoul or something.
Sometimes I feel like the author forgets they're supposed to be grown up sometimes. I mean it's cute, but also confusing.
Why not call out the brother on that conversation too? They've never really acted like they need to be super afraid of the princes like they are the emperor. Okay, yeah so they can steep in a cataclysmic misunderstanding because Koreans love their drama. Meh.