Now that Eorini has finally been identified, it's up to attempted memory triggers by her brothers and various flashbacks to explain how exactly Eorini has not been able to recognize anything of her own life. It's not clear to me that Eorini was really young enough for such brainwashing to plausibly work, and the motives for anyone to even try it in the first place were comically pointlessly evil for the sake of being evil. Haven't we had enough of that by now?
Apparently not, because King Yeonsangun fills the other parts of this episode with the usual trying to solve problems with needlessly violent orders that just make people more angry at him. Although the real kicker is that King Yeonsangun remains completely oblivious as to why people hate him so much. We always get these juxtapositions of King Yeonsangun enjoying traditional performances while outside the palace people are beaten to death for being in the wrong place at the wrong time.