Ha Buk Paeng’s youngest son 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

Ha-Buk-Paeng’s greatest strength, Paeng Jihuk. Paeng Jihuk heads to Nakhogok to save a family from being attacked by demons, but everything was a trap. On the verge of death, he became angry at the fact that he was abandoned by the family he loved. ‘Again… If I was given one more chance…!’ Paeng Jihuk, who had thought he was dead, wakes up in a room in the body of the master of Ha -Buk-Paeng.