Seo Yi-sook: Biography, Filmography, and Personal Life

You’ve probably seen her face in a dozen K-dramas without ever knowing her name. That’s the hallmark of a character actress like Seo Yi-sook, who has quietly built one of the most varied filmographies in South Korean television. From the regal halls of Empress Ki to the supernatural corridors of Hotel del Luna, her career spans nearly four decades—and the number of roles she’s played might surprise even dedicated fans.

Born: December 6, 1966 ·
Nationality: South Korean ·
Occupation: Actress ·
Education: Chung-Ang University (Korean Music) ·
Notable works: Empress Ki, Hotel del Luna, The World of the Married

Here is a quick reference of Seo Yi-sook’s key biographical details:

Who is Seo Yi-sook?

Early life and education

• Born December 6, 1966 according to Wikipedia (online encyclopedia).
• However, other sources disagree: MyDramaList (user-curated drama database) lists October 25, 1967, and DramaForLife Wiki (fan wiki) gives January 15, 1968.
• She studied Korean Music at Chung-Ang University, a well-regarded institution in Seoul (ElCinema (entertainment database)).

What this means: The conflicting birth data is a reminder that even established actors may have incomplete public records. The most cited date among reputable databases remains December 6, 1966.

Career beginnings

• Seo Yi-sook began her career in theatre, debuting on stage in the late 1980s (Kpop Profiles (fan community site)).
• A theatre actor for years before transitioning to screen, her stage training shows in the emotional depth of her TV roles.

The pattern: Her theatrical roots explain why she consistently delivers memorable performances even in minor supporting parts.

The implication: This foundation is what allows her to disappear into roles without needing the spotlight.

What are Seo Yi-sook’s most famous films and TV series?

Television dramas

Eight major drama credits over a decade, one pattern: each role is a scene-stealing supporting part that adds texture to the main story.

Film appearances

• 2010: Best Seller – daughter of the original writer (MyDramaList (user-curated drama database))
• 2014: The Fatal Encounter – Go Soo-Ae (Viki (streaming platform))
• 2017: The Mayor – Byun Jong-Goo’s wife (NamuWiki (community wiki))

The catch: While her filmography is less extensive than her TV work, each film role adds a different shade to her range.

The pattern: This versatility is exactly what makes her indispensable to ensemble casts.

What is known about Seo Yi-sook’s personal life and online presence?

Family

• Seo Yi-sook’s marital status is not publicly confirmed (Kpop Profiles (fan community site)).
• She has not disclosed any information about children.

The implication: Unlike many K-drama actors who share personal details, Seo Yi-sook has kept her private life largely out of the spotlight—consistent with a veteran theatre performer who lets the work speak.

Social media

• She maintains an active Instagram account @seoyisook.
• Her feed includes behind-the-scenes photos, drama promotions, and personal moments.

The consequence: This balanced online presence keeps fans engaged without oversharing.

Timeline: Key milestones in Seo Yi-sook’s career

Seven career markers, one pattern: steady progression from theatre to television, with no sign of slowing down.

• 1986: Theatre debut (NamuWiki (community wiki))
• 2010: Television debut in Jejungwon (MyDramaList (user-curated drama database))
• 2013–2014: Breakout supporting role in Empress Ki (Viki (streaming platform))
• 2017: Wins Best Supporting Actress for The Rebel (AsianWiki (user-contributed database))
• 2019: Iconic role as God Mago in Hotel del Luna (MyDramaList (user-curated drama database))
• 2020: Appears in record-breaking drama The World of the Married (MyDramaList (user-curated drama database))
• 2023–2024: Continued high-profile roles in King the Land and Red Swan (MyDramaList (user-curated drama database))

The progression: From theatre stages to prime-time K-dramas, her career arc reflects a rare commitment to craft.

Clarity check: what we know vs. what’s uncertain

Confirmed facts

• Birth date of December 6, 1966 is listed on Wikipedia (online encyclopedia).
• She graduated from Chung-Ang University with a degree in Korean Music (ElCinema (entertainment database)).
• Her drama credits span from 2010 to 2024 with verified entries on MyDramaList (user-curated drama database) and AsianWiki (user-contributed database).
• She won a Best Supporting Actress award for The Rebel (2017) (AsianWiki (user-contributed database)).

What remains unclear

• Exact birth year: three different values across major databases (1966, 1967, 1968).
• Birthplace: some sources say South Korea generally, others specify Incheon.
• Family details: no reliable confirmation of husband or children.

The trade-off: The uncertainty around basic biographical data is common for supporting actors who focus on work over publicity. For researchers and fans, this means cross-referencing multiple sources is essential.

“Seo Yi-sook is a South Korean actress and theatrical actress who debuted in stage performance in the late 1980s.”

— Kpop Profiles (fan community site)

“She is known for significant roles in Knight Flower and Hotel Del Luna.”

— Viki (streaming platform)

For Korean drama enthusiasts, the takeaway is straightforward: Seo Yi-sook is a reliable character actor whose body of work deserves more recognition. Whether you’re catching up on Empress Ki or Hotel del Luna, her performances add depth that elevates every ensemble she joins.

Frequently asked questions

The verdict: These FAQs address the most common curiosities while acknowledging the gaps in publicly available information.