dandu ( Guillotine) is a Manga/Manhwa/Manhua in english language, Martial Arts series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

부모님의 원수를 갚기 위해 고전분투하는 단영, 단린, 두 오누이의 성장과 복수의 여정
Danyoung, Danlin and two sisters struggle for revenge on their parents' enemies and the journey of revenge