Akdang Gajogi Dongnibeul Bandaehanda

A distant echo from a life long-forgotten; shattered shards of an ominous future. When her late mother’s heirloom pendant is broken, Elodie Perdia regains the memories of Ga-Eul Yun, a girl from our world who realizes she’s landed in the body of a villainess from a fantasy novel. In the story, Elodie serves as the dark foil to the virtuous heroine and is destined for an early grave – a dark fate that can perhaps be avoided with Ga-Eul’s knowledge of future events!
(Source: WEBTOONS, edited)