Invincible Guard

A fate-changing encounter. Jang Cheon-un was born the son of a third-rate warrior. After losing his father and getting involved with a gang, he lived a rough life until one day he saved a dying old man (Old Man Mu) by the river. As he spent time with the old man, Cheon-un began having strange dreams every night; in his dreams, he started learning martial arts from him, and in reality, he also began to grow stronger. One day, the Musketeers of Gucheonseong appeared, tracking the old man. The old man, who had been hiding his identity, vanished, and Cheon-un, accidentally entangled with them, was inducted into Gangnyeongok, the martial arts training institution of Gucheonseong. Gangnyeongok is Gucheonseong's martial arts training facility. Cheon-un grew through repeated training amidst fierce competition. Despite ridicule and contempt, he gradually proved his skills and began to gain recognition. Finally, he was selected as the bodyguard of the Lord of the Small Castle. However, the duty of a bodyguard was not merely personal protection, but survival amidst political conspiracies and intrigues. Within Gucheonseong, factions vying for control of the castle gradually began to emerge. Lord So Seong-ju senses an internal threat, but the shadows of the enemy have already fallen deep. As he faces a situation where he himself becomes a target while protecting Lord So as his bodyguard, Cheon-un makes a resolution. "I will not protect you by sacrificing my life; instead, I will become invincible and protect you without ever dying!" A crisis looms in which Lord So's life is threatened amidst a pincer attack by an internal traitor and external forces. Cheon-un must no longer be a mere bodyguard, but a warrior who carves out his own destiny. He draws his sword to survive the vortex of chaos.