Demonic Sword Immortal summary:

The ‘Yanggang Blood Demon’ dyes the Yangtze River blood red! He is eventually punished for all kinds of evil deeds, and just before he dies, he puts his soul into his new weapon, 'Destruction Hoecheondo'. After such a long time, one day, Hyeon-ok Hyeong-ok and his daughter Song-yeon Jang-gang Hyeol-ma, who had been scraping by each day to eat each day, accidentally discovered the 'Immortal Hoecheondo' in the stomach of a fish. He dreams of becoming a world demon... But Hye-jae-ok has a hidden talent that the Jang-gang blood demon doesn't know about?! A powerful battle unfolds between Jang Gang Blood Demon and Cash Ok, who are just looking for a chance to steal the body!