6 Officers Who Fought Beside Yi Sun-sin, By Role

Who Stood Beside Yi Sun-sin? The Officers of the Joseon Navy

From Na Dae-yong to Song Hui-rip, six Joseon navy officers who fought alongside Yi Sun-sin, organized by documented rank, unit, and role.

Ask who fought beside Yi Sun-sin in the Joseon navy, and you'll often just get "loyal officers" — a label that flattens six very different roles: a shipwright officer, a local commander who knew the coastal currents, a fleet commander who led his own ships, and officers who served at Yi Sun-sin's side across multiple campaigns. This list picks six figures directly connected to Yi Sun-sin and organizes them by the rank and role each actually held within the fleet.

Rather than sorting people into loyal heroes and everyone else, we read them by rank, unit, and the battles they're documented in — that's what actually shows how the Joseon navy was organized. The order here follows the kind of role each held (technical, local knowledge, command, sustained field service), not popularity, and anecdotes not confirmed in official sources have been left out.

How this list was built

Rank and unit as confirmed by the Korea Heritage Service and Hyunchungsa Shrine
Only relationships to Yi Sun-sin documented within the chain of command
Dramatized details from TV or fiction are not mixed in without being flagged

Read each entry by rank first, then check which fleet and period that person served in.

Na Dae-yong

Na Dae-yong is documented as a military officer involved in warship design and construction under Yi Sun-sin. His name comes up repeatedly in accounts of Joseon naval shipbuilding, including the turtle ship — worth remembering as a figure behind the technology rather than a battle commander. He's also said to have held later posts connected to ongoing naval shipbuilding.This entry follows what's confirmed in official sources from the Korea Heritage Service and Hyunchungsa Shrine; specific claims about his exact design contribution vary between records and aren't stated as settled fact here. Treat any account crediting him as the turtle ship's sole inventor with caution.

Eo Yeong-dam

Eo Yeong-dam served as an officer under the Left Jeolla Naval Command and is referenced for his detailed knowledge of local waters and tides, which shaped how the fleet planned its routes. In a period with limited coastal survey data, that kind of firsthand local experience had real bearing on battle planning.He's also described as having taken a vanguard role in combat, though specific casualty or engagement figures differ across sources, so this entry follows the official record's framing. His case is a useful example of how local geographic knowledge factored into fleet operations.

Yi Eok-gi

Yi Eok-gi commanded the Right Jeolla Navy and joined Yi Sun-sin's Left Jeolla fleet in several combined naval battles. In engagements where all three provincial navies operated together, he led his own fleet as a separate command — a relationship better understood as command-level cooperation than personal friendship.He's recorded as having died at the Battle of Chilcheollyang during the second Japanese invasion, a useful reference point for understanding the losses the Joseon navy suffered in that period.

Jeong Un

Jeong Un held the post of Nokdo manho and took part in the early naval battles of the Imjin War. He's recorded as having fought through engagements including Okpo and Sacheon up to the Battle of Busanpo, where he died in combat, serving as one of the commanders who worked alongside Yi Sun-sin in the fleet's early operations.His activity in these early battles is easier to place in context alongside the Joseon navy's broader effort to organize itself in the war's first year.

Gwon Jun

Gwon Jun served as magistrate of Suncheon and was one of the commanders under the Left Jeolla Navy. He's recorded as taking part in multiple naval battles as part of Yi Sun-sin's fleet, combining his role as a regional administrator with fleet support and command.Because the level of detail about him varies across sources, this entry treats his sustained participation across several engagements as the key fact, rather than any single battle's outcome.

Song Hui-rip

Song Hui-rip was a military officer who fought alongside Yi Sun-sin across multiple battles, with documented activity through the Battle of Noryang, the war's final naval engagement. He's known to have remained in naval service even after the war ended.That long span of field experience marks him as someone who played a sustained, hands-on role within the navy's organization rather than a single-battle figure — closer to a career officer than a top commander.

How to read this list

Rather than memorizing six names as one block, it helps to sort them by role. For shipbuilding, start with No. 1 Na Dae-yong; for local knowledge and battle planning, No. 2 Eo Yeong-dam; for the command structure of the combined three-province fleet, No. 3 Yi Eok-gi and No. 4 Jeong Un; for long-term service at Yi Sun-sin's side, No. 5 Gwon Jun and No. 6 Song Hui-rip.

When comparing relationships between these figures, check whether they served in the same fleet, cooperated within the chain of command, or are simply described as close — those are different claims. Details dramatized for TV or local festivals can diverge from the official record.

This entry reflects official sources such as the Korea Heritage Service and Hyunchungsa Shrine as of the research date; specific details vary between records, so check the relevant institution's own materials for the most current account.

Frequently asked questions

Where can I learn more about the officers who served with Yi Sun-sin?

Hyunchungsa Shrine, regional naval history museums, and the Korea Heritage Service publish profiles of individual officers. It's worth separating those official records from dramatized details added in festivals or TV dramas.

What was the relationship between Yi Eok-gi and Won Gyun?

Yi Eok-gi, as Right Jeolla Naval Commander, operated alongside Won Gyun's Gyeongsang Right Navy within the combined three-province fleet. That relationship was one of command-level cooperation — there isn't enough documented evidence to treat any personal friendship between them as established fact.

Did Na Dae-yong build the turtle ship by himself?

Na Dae-yong is referenced in connection with warship research and construction, but crediting the turtle ship's development to one person oversimplifies it. Official sources describe it as a collaborative effort involving Yi Sun-sin and multiple officers and craftsmen.

How did Jeong Un's and Yi Eok-gi's roles differ?

Jeong Un held the post of Nokdo manho and fought through the war's early battles up to Busanpo, where he died in combat. Yi Eok-gi commanded the Right Jeolla Navy as a separate fleet and died later, at the Battle of Chilcheollyang during the second invasion. Different fleets and different periods, so they shouldn't be grouped as the same kind of role.

What ranks did Song Hui-rip and Gwon Jun hold?

Song Hui-rip served as a military officer at Yi Sun-sin's side, with documented activity through the Battle of Noryang. Gwon Jun was magistrate of Suncheon and one of the commanders under the Left Jeolla Navy. Both are recorded as having taken part in multiple naval battles.

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How this list was built

Na Dae-yongUpvote

Eo Yeong-damUpvote

Yi Eok-giUpvote

Jeong UnUpvote

Gwon JunUpvote

Song Hui-ripUpvote