Jumong is based on the founding myth of Goguryeo (37 BC – 668 AD), one of Korea’s Three Kingdoms. Traditionally, the myth says Jumong was born from an egg (his name literally means "master of archery") and possessed supernatural skills from birth.
The drama takes enormous creative liberties. In history, Jumong was likely a ruthless, skilled warlord. In the drama, he is a soft-hearted underdog. Episode 1 establishes that his "greatness" is not innate; it is forged through suffering (the death of Hae Mo-su) and love (his bond with Soseono).
The character of Soseono is also heavily fictionalized. Historically, she is a footnote as Jumong’s second wife. In the drama, she becomes a co-founder of the nation, a brilliant businesswoman, and arguably the series' true strategic genius. jumong ep 1
The episode jumps forward roughly 20 years. We finally meet the adult Jumong, and he is not what we expect. He is not a noble, brooding prince. He is a scrawny, disheveled, and infuriatingly clumsy young man. He cannot shoot an arrow straight. He falls into rivers. He is the laughingstock of the few servants who know his true identity.
This is the genius of Jumong. Unlike typical heroes born with a sword in hand, Jumong is an underdog. He is a prince who lives in a hut, not a palace. He spends his days hunting (poorly) and dreaming of a mother he barely knows. Jumong is based on the founding myth of
His only friends are his loyal servant, Mopalmo (Im Hyuk), and a mysterious swordsman who appears to train him in secret: Hae Mo-su, now living in hiding. Hae Mo-su sees something in the boy—a spark of the lost Gojoseon spirit.
The emotional core of Episode 1 lies in the tragic romance between Haemosu (played by Hur Joon-ho) and Yuhwa (Oh Yeon-soo). Haemosu is introduced as the leader of the Damul Army, a resistance group fighting against the Han invaders. In a lesser drama, the "hero’s parents" might be sidelined, but Jumong gives them a full narrative arc within the premiere. The episode jumps forward roughly 20 years
Their meeting is fateful—Haemosu is wounded and stumbles upon Yuhwa, the daughter of the Habaek tribe chief. Their connection is instant, but their love story is doomed from the start. The script wastes no time in showcasing the brutality of the era. Haemosu is captured by the Han forces in a devastating ambush, and Yuhwa’s tribe is decimated.
This separation is the catalyst for the entire series. It establishes the "missing father" trope that defines Jumong’s later life and introduces the heavy burden of destiny that the child, not yet born, will have to carry. Yuhwa’s resilience in the face of enslavement and displacement sets a precedent for the strong female characterization that runs throughout the show.