Geuksosu

A story of murder and violence, "Unhinged" follows Erika as she walks a path of vengeance. Seven years ago, Erika came home to find her husband murdered. Unable to find any other suspects, Erika was found guilty and spends most of a decade plotting her revenge from the inside of a cell. Once freed, she finds herself moving past the boundaries of "respectable" society and beyond the shackles of morality. Laws will be broken, lives will be lost, and, yes, there will be blood.

(Source: Lezhin US)

Note: Chapter count includes a prologue and a 6-chapter side story