
Seo Kang-joon
Biography
Lee Seung Hwan, known professionally as Seo Kang Joon, is a South Korean actor, model, singer, and former member of 5URPRISE (서프라이즈). He graduated from Sanbon High School and later obtained an associate's degree in Acting from Dong Seoul University. Before debuting, he worked as a part-time model to pay for college.
In September 2013, Fantagio (판타지오) launched a new project group called 5URPRISE. The group members were selected through Fantagio's "Actor′s League," a program for discovering aspiring actors, and were trained for two years before making their entertainment debut. But, unlike idol groups, they began their careers as actors and then expanded into acting.
He made his acting debut in 2013 with a role in the web drama "After School: Lucky or Not". They released the single "Hey U Come On" as an OST for the drama and also began appearing in the music videos of labelmate group HELLO VENUS.
In 2014, he got his first lead role in "Cunning Single Lady", for which he won the Best New Actor award at the 7th Korea Drama Awards.
He made his official singing debut in November 2014 as 5URPRISE's leader, vocalist and face of the group with their first single album, "From My Heart". The following year, they made their Japanese debut with the single album, "5urprise Flight". However, some of the members began getting more acting opportunities so the group had another Japanese single album in August 2016 and then stopped releasing new material.
The members' contracts with Fantagio ended in March 2020 and the group officially disbanded. He enlisted for his mandatory military service on November 23, 2021, and was discharged on May 22, 2023.
He is currently represented by Man Of Creation (맨오브크리에이션).
Known For

TV
Running Man
2010

TV
Home Alone
Self
2013

TV
Law of the Jungle
2011

TV
Boyfriend on Demand
Seo Eun-ho
2026

TV
KBS Drama Special
2010

TV
Busted!
Kang-Joon Seo
2018

TV
Hwajung
Hong Joo-won
2015

TV
Undercover High School
Jeong Hae-sung
2025

TV
What Happens to My Family?
Yoon Eun-Ho
2014

TV
When the Weather Is Fine
Im Eun-seop
2020

TV
Are You Human?
Nam Shin / Nam Shin III
2018

TV
Good Doctor
One of the punks who wants to beat Shi On
2013

TV
Entourage
Cha Young-Bin
2016

TV
The Suspicious Housekeeper
Choi Soo Hyuk
2013

TV
The Third Charm
On Joon Young
2018

TV
Roommate
Self
2014

TV
WATCHER
Kim Young-Koon
2019

TV
Melon Music Awards
Messenger
2009

TV
Grid
Kim Sae-ha
2022

TV
To the Beautiful You
One of the guys putting ghost makeup on Song Jong Min's group
2012
Filmography
2026TVBoyfriend on Demandas Seo Eun-ho2025TVUndercover High Schoolas Jeong Hae-sung2022TVGridas Kim Sae-ha2021FilmA Year-End Medleyas Yi-kang2020TVWhen the Weather Is Fineas Im Eun-seop2019TVWATCHERas Kim Young-Koon2018TVThe Third Charmas On Joon Young2018TVAre You Human?as Nam Shin / Nam Shin III2018TVBusted!as Kang-Joon Seo2017TVIdol Feveras Do Yun's older brother2016TVEntourageas Cha Young-Bin2016TVEntertaineras Lee Sang-Won2016TVCheese in the Trapas Baek In-ho2015FilmSummer Snowas Sang-gyu2015FilmThe Beauty Insideas Woo-jin 922015TVTo Be Continuedas Ah-rin's elder brother2015TVHwajungas Hong Joo-won2014TVThe Best Futureas Choi Go2014FilmMy Love, My Brideas Joon-soo2014FilmBomi's Roomas Self2014TVWhat Happens to My Family?as Yoon Eun-Ho2014TVRoommateas Self2014TVCunning Single Ladyas Gook Seung-hyun2013FilmHaneuljae’s Murderas 尹河2013TVThe Suspicious Housekeeperas Choi Soo Hyuk2013TVAfter School: Lucky or Not2013TVGood Doctoras One of the punks who wants to beat Shi On2013TVHome Aloneas Self2012TVTo the Beautiful Youas One of the guys putting ghost makeup on Song Jong Min's group2011TVLaw of the Jungle2010TVRunning Man2010TVKBS Drama Special2009TVMelon Music Awardsas Messenger—TV너 말고 다른 연애as Namkoong Ho