Youngest Son of the NamGung Clan is a Manga/Manhwa/Manhua in english language, Action 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

[From the studio behind SSS-Class Suicide Hunter:]
This is the story of NamGung DeSo, the youngest son of the NamGung Clan! After losing his dantian in the competition for the position of vice-patriarch, he then faces an unexpected death out of nowhere and regresses into the past… The youngest son of the strongest clan? Such a title is way too bothersome. Let someone else become the strongest person or whatever! Can the former trash of the clan make the most out of his second chance at life?