Seo Kang-joon

Seo Kang-joon

Lee Seung-hwan (born October 12, 1993), known professionally as Seo Kang-joon, is a South Korean actor and former singer, who was a member of the group 5urprise. He gained recognition with his role in the television series Cheese in the Trap (2016) and has since starred in Are You Human? (2018), Watcher (2019), When The Weather Is Fine (2020), Grid (2022), Undercover High School (2025), and Boyfriend on Demand (2026).

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Known For

Running Man

Running Man

2010

Home Alone

Home Alone

2013 • as Self

Law of the Jungle

Law of the Jungle

2011

KBS Drama Special

KBS Drama Special

2010

Undercover High School

Undercover High School

2025 • as Jeong Hae-sung

Busted!

Busted!

2018 • as Kang-Joon Seo

Filmography

2026

A Love Other Than Yours
A Love Other Than Yours
as Namgung Ho
TV - Released: 9/12/2026
Boyfriend on Demand
Boyfriend on Demand
as Seo Eun-ho
TV - Released: 3/6/2026

2025

Undercover High School
Undercover High School
as Jeong Hae-sung
TV - Released: 2/21/2025

2022

Grid
Grid
as Kim Sae-ha
TV - Released: 2/16/2022

2021

A Year-End Medley
A Year-End Medley
as Yi-kang
Movie - Released: 12/29/2021

2020

When the Weather Is Fine
When the Weather Is Fine
as Im Eun-seop
TV - Released: 2/24/2020

2019

WATCHER
WATCHER
as Kim Young-Koon
TV - Released: 7/6/2019

2018

Are You Human?
Are You Human?
as Nam Shin / Nam Shin III
TV - Released: 6/4/2018
The Third Charm
The Third Charm
as On Joon Young
TV - Released: 9/28/2018
Busted!
Busted!
as Kang-Joon Seo
TV - Released: 5/4/2018

2017

Idol Fever
Idol Fever
as Do Yun's older brother
TV - Released: 7/7/2017

2016

Cheese in the Trap
Cheese in the Trap
as Baek In-ho
TV - Released: 1/4/2016
Entourage
Entourage
as Cha Young-Bin
TV - Released: 11/4/2016
Entertainer
Entertainer
as Lee Sang-Won
TV - Released: 4/20/2016

2015

The Beauty Inside
The Beauty Inside
as Woo-jin 92
Movie - Released: 8/20/2015
Summer Snow
Summer Snow
as Sang-gyu
Movie - Released: 10/28/2015
Hwajung
Hwajung
as Hong Joo-won
TV - Released: 4/13/2015
To Be Continued
To Be Continued
as Ah-rin's elder brother
TV - Released: 8/18/2015

2014

Bomi's Room
Bomi's Room
as Self
Movie - Released: 8/21/2014
My Love, My Bride
My Love, My Bride
as Joon-soo
Movie - Released: 10/8/2014
Cunning Single Lady
Cunning Single Lady
as Gook Seung-hyun
TV - Released: 2/27/2014
Roommate
Roommate
as Self
TV - Released: 5/4/2014
What Happens to My Family?
What Happens to My Family?
as Yoon Eun-Ho
TV - Released: 8/16/2014
The Best Future
The Best Future
as Choi Go
TV - Released: 10/28/2014

2013

Haneuljae’s Murder
Haneuljae’s Murder
as 尹河
Movie - Released: 12/5/2013
The Suspicious Housekeeper
The Suspicious Housekeeper
as Choi Soo Hyuk
TV - Released: 9/23/2013
Good Doctor
Good Doctor
as One of the punks who wants to beat Shi On
TV - Released: 8/5/2013
After School: Lucky or Not
After School: Lucky or Not
TV - Released: 9/2/2013
Home Alone
Home Alone
as Self
TV - Released: 3/22/2013

2012

To the Beautiful You
To the Beautiful You
as One of the guys putting ghost makeup on Song Jong Min's group
TV - Released: 8/15/2012

2011

Law of the Jungle
Law of the Jungle
TV - Released: 10/21/2011

2010

Running Man
Running Man
TV - Released: 7/11/2010
KBS Drama Special
KBS Drama Special
TV - Released: 5/15/2010

2009

Melon Music Awards
Melon Music Awards
as Messenger
TV - Released: 12/16/2009