Invincible Bodyguard

Jang Cheon-un lost his father, a devoted bodyguard who died in the line of duty, and was left to survive as a street thug in the back alleys. His life takes an unexpected turn when he saves a dying old man, after which he begins learning martial arts through vivid dreams every single night. Swept into the affairs of Gucheonseong, the most powerful faction under heaven, Cheon-un endures relentless scorn and grueling training. Through sheer perseverance, he eventually earns the position of personal bodyguard to Sima Gyeong, the young lord of the estate. However, dark conspiracies and treacherous betrayals surrounding the faction's power soon point their blades directly at both the young lord and his new protector. Rather than proving his loyalty by sacrificing his life like his father did, Cheon-un chooses a different path. He vows to become truly invincible so that he can protect everyone without dying for them. Thus begins his unstoppable journey of survival and growth as a bodyguard unlike any other.