Breezed through til ch.14
SPOILERS https://forum.novelupdates.com/threads/surviving-as-a-maid.105138/
END: She went back to her ori world. And in SS novel, red haired duke and blonde long haired mage chased after her to her world and she got engaged to them both. Knight dies, and possibly follows the 3 to her world afterwards.
Concubine uses dark magic to make people falls in love with him (King was his ex-lover's reincarnation who died).
Queen dies of illness; King and concubine captured by enemy empire as war prisoners; the prince (Queen and concubine's son) will be King at the end.
Surviving As A Maid