From a Knight to a Lady(2021)

Geu Gisaga Lady-ro Saneun Beop

When Estelle meets her untimely death, she is a valiant knight of the Kingdom of Ersha. But death is not the end for Estelle - four years after her demise, she finds herself reincarnated in the body of Lucifela Aydin, the spoiled and cold-hearted daughter of a count in the Empire of Jansgar. To her dismay, she finds that her country fell to Jansgar years ago, and that she is now betrothed to Zedekiah Heint, the son of a count and her adversary in her previous life. Can Estelle discover the truth behind her death while attempting to navigate her new life as Lucifela?

(Source: Tappytoon)

Note: Includes 14 extra chapters.