I hope the king just regains his memories gradually and remembers the truth about who saved him. It's pretty nice that our main lead gave the concubine the chance to come clean.
I feel triggered when subbers don't sub what characters wrote on papers and stuff, considering she's a calligraphist and I wand to know what her work is saying that amounts to a lot being lost with no translation.
It initially sounded a lot like the movie The Spy Who Dumped Me. But it seems like it'll be somewhat different!