Hwanggeumui Segyereul Neoege

The world is divided into two: the ‘Moon Kingdom’ where humans live, and the ‘Sun Kingdom’ where demons dwell. Estelle, a knight of the Moon Kingdom, loses her family in a demon attack. Entangled with a strange demon girl, she is even given a terminal diagnosis. To survive, she must journey to the tower in the north. A timid knight girl, a slave boy, and a demon king turned ghost. The story of three who embark on an adventure to find life.

(Source: Naver, translated)

*Note: Includes one extra chapter.*