There won't be a happy ending for the queen, she died from an illness sadly. The queen doesn't even get the justice she deserves. You might wonder why the baby is blonde, hm? This ASSHOLE of a king forced the queen to sleep with that concubine. Why? He wanted a child that would resemble that homewrecker.
That blonde manwhore is even more crazy than our beloved king. Turns out our lovely king is the reincarnation of Yurgel's deceased male lover. Our dear Yurgel was a mage (~or archmage?) and immortal. he used whatever magic to die, (from what I've heard) presumably to follow his lover.
Once he met our wonderful king, he made the king love him using black magic, how romantic~! Kyaa! Now that it's taking a toll on his now rotting body, he needed a clone~! Which is the prince, why? So that the both of them could ✨ 𝓵𝓸𝓿𝓮 𝓮𝓪𝓬𝓱 𝓸𝓽𝓱𝓮𝓻 𝓯𝓸𝓻𝓮𝓿𝓮𝓻 ✨ Well, some say incest is wincest. (they're technically not- nevermind. It's still wrong)
I could care less about our MC, she ends up with a duke, though she chose to go back to Korea in the end.
Though i'm upset of how the story went (mainly because of the quee- I don't have to explain) there's still a part of me that's okay with it, cause not all stories have a happy ending. I don't completely hate the fact that our MC went back at the end, since these types of stories start with them going on like "Wtf!! I isekai-ed?! I'll survive and go back to my world!!" but never actually going back cause they fell in love, haha. I found her decision more realistic than what an average i'm-gonna-be-a-saint type MC would make... well thats romance MCs I guess.