The Postmaster's Granddaughter Hides Her Martial Arts

Born with the Nine Yin Severed Meridians, my little sister, Euna, was slowly dying. After our parents passed away, I worked at our grandfather's escort agency, trying desperately to find her an elixir… But it all went up in smoke with the sudden attack of unknown assassins one night. Euna, who shoved a life-saving pill into my mouth as she collapsed, shielding me. - Unnie… you have to live a long, long life. …Promise me. To keep my promise to my sister, I lived for eight more years. In a hellish world, I became infamous as the Blood Demon Witch, Hunting down and eliminating those who killed Euna, one by one. At the end of that path of carnage, I thought I could finally join Euna… Bu...