The Pale Horse is a webtoon originally published on the Korean comic site Daum. It's written and illustrated by Hae-Yeon Chu (Hangul: 추혜연). An official English translation is provided on SpotToon.
Set in 1835, France. Rose Dupré is the daughter of ostracized Léa Dupré, whom the village claims to be a witch. Rose grows up to be a lonely and bullied girl, finding company only in her best friend Péter "Pierre" Grand.