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Seo In-guk (born October 23, 1987), is a South Korean singer-songwriter and actor. He began his singing career after winning the talent reality show Superstar K in 2009, and made his acting breakthrough in Reply 1997 (2012). Since then, he has starred in television series, High School King of Savvy (2014), Hello Monster (2015), Shopping King Louie (2016), and Death's Game (2023).

See You at Work Tomorrow!
as Kang Si-woo

Boyfriend on Demand
as Park Kyeong-nam

Boy
as Mad Hatter

Twelve
as Won-seung

Better Late Than Single
as Self - Cupid Expert

Jungle Bob
as Self

ZIP DAESUNG
as Self

Hyell's Club

Death's Game
as Choi Yee-jae

The Boys
as Lee Jae-seok

Nattering with Nah
as Self

TRAP by SEO IN GUK

The Seasons
as Self

Project Wolf Hunting
as Park Jong-du

Look, My Shoulder's Dislocated
as Self

Café Minamdang
as Nam Han-jun

Soundtrack #1
as Jay Jun

Pipeline
as Pindol / Kang Sae-dol / Drill-bit

Doom at Your Service
as Myul Mang / Kim Sa-ram

Navillera
as Hwang Hee

Abyss
as Grim Reaper

The Smile Has Left Your Eyes
as Kim Moo-Young

I Love That Crazy Little Thing
as Yang Ming-zhe

Shopaholic Louis
as Louie

Squad 38
as Yang Jung-do

She Was Pretty
as Self

Oh My Ghost
as Edward

I Remember You
as Lee Hyun

The King's Face
as Prince Gwanghae

High School King of Savvy
as Lee Min-seok / Lee Hyung-seok

Another Parting
as Ahn Young Mo

SBS: The Master's Sun - Making
as Self

No Breathing
as Jo Won-il

Reply 1994
as Yoon Yoon-jae

Master's Sun
as Kang-woo

Home Alone
as Self

아들 녀석들
as Yoo Seung-Gi

Reply 1997
as Yoon Yoon-jae

Baeksang Arts Awards
as Self

Love Rain
as Kim Chang-mo & Kim Jeon-seol

SNL Korea
as Self

Law of the Jungle

Running Man

Superstar K
as Self - Participant

You Hee-yeol's Sketchbook
as Self

KBS Entertainment Awards
as Host

KBS Drama Awards
as Host
The Office Worker Who Sees Destiny
as Choi Young-hoon