Set in 108 BCE following the fall of Gojoseon, *Jumong* epicly chronicles the founding of Goguryeo. Hae Mosu, a fierce resistance leader fighting the invading Han Dynasty, falls in love with Lady Yuhwa. Betrayed by his ambitious friend, Geumwa, Hae Mosu is captured and seemingly executed by the Han, leaving a pregnant Yuhwa. Pitying her, King Geumwa takes Yuhwa in, raising her son, Jumong, alongside his own jealous biological sons, Daeso and Youngpo.Growing up, Jumong is a cowardly, reckless playboy, unaware of his royal lineage. Desperate to escape his half-brothers' constant murder plots, Jumong is exiled and eventually crosses paths with So Seo-no, a brilliant merchant’s daughter. Through her guidance, Jumong undergoes a profound
transformation. He discovers his true father is the legendary Hae Mosu—who survived years of imprisonment—and undergoes brutal
martial arts training under him. However, tragedy strikes when Daeso and the Han army assassinate Hae Mosu, devastating Jumong and cementing his lifelong hatred for the Han and his adoptive brothers.Driven by destiny, Jumong reclaims his place in Buyeo, pretending to remain weak while secretly gathering an army of refugees and forging alliances. He earns the deep love of So Seo-no, though political pressures and personal sacrifices complicate their romance. Jumong masters archery and military strategy, becoming a beacon of hope for the oppressed populations scattered across the region. When Daeso ascends to power in Buyeo and attempts to eliminate him, Jumong realizes he cannot coexist with Buyeo's corrupted leadership.Fulfilling the prophecy of the three-legged crow, Jumong breaks away to establish a new sovereign nation. He unites the Tamul army and various displaced tribes, fighting relentless battles against both Buyeo and the Han Dynasty. So Seo-no stands bravely by his side, utilizing her vast merchant wealth and logistical genius to fund the military campaigns. Jumong successfully defeats his enemies, rescues his mother, and establishes Goguryeo in 37 BCE.Despite his ultimate triumph, the narrative carries bittersweet undertones. Political necessity and the complex dynamics of nation-building force sacrifices, particularly regarding Jumong's relationships. So Seo-no eventually leaves Goguryeo with her sons to forge her own path southward, leaving Jumong as the sole monarch of a legendary empire. Through grit, tactical brilliance, and supernatural destiny, Jumong transcends his troubled youth to become the revered Sacred King and the eternal founding father of Goguryeo.