Amidst a fierce battle between Han Dynasty general Yu Cheon and Jaecheongeum leader Kim Yung, the infant Su-ro is born. After the tragic death of his biological father, the baby is found and adopted by Jo Bang, a furnace master who vows to keep the child's true noble parentage a secret to protect him. Focus on Iron:

Meanwhile, in the Han Dynasty, a royal lady named is forced to flee a political massacre. She boards a ship heading toward the Korean peninsula, carrying a child she believes is destined for greatness. The Storm and the Sacrifice

The narrative sets up a lifelong competition for the throne between Su-ro and his half-brother, Ijinashi. Where to Watch Kim Su-Ro, The Iron King - AsianWiki

| | English Sub Used | |------------|----------------------| | Wang (왕) | King | | Daegun (대군) | Grand Prince | | Gungnyeo (궁녀) | Court Lady | | Cheonjae (천재) | Divine child / Prodigy | | Cheol (철) | Iron |

You might be tempted to just watch the raw video for the action, but The Iron King is a dialogue-heavy drama. The political machinations in Episode 1 lay the groundwork for the next 31 episodes.