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).
Acting
TV
Are You Human?
as Nam Shin / Nam Shin III
2018
Movie
The Beauty Inside
as Woo-jin 92
2015
TV
Running Man
2010
Movie
A Year-End Medley
as Yi-kang
2021
TV
Boyfriend on Demand
as Seo Eun-ho
2026
TV
Cheese in the Trap
as Baek In-ho
2016
TV
When the Weather Is Fine
as Im Eun-seop
2020
TV
Good Doctor
as One of the punks who wants to beat Shi On
2013
TV
Grid
as Kim Sae-ha
2022
TV
Undercover High School
as Jeong Hae-sung
2025
TV
Busted!
as Kang-Joon Seo
2018
Movie
My Love, My Bride
as Joon-soo
2014
TV
To the Beautiful You
as One of the guys putting ghost makeup on Song Jong Min's group
2012
TV
The Best Future
as Choi Go
2014
TV
To Be Continued
as Ah-rin's elder brother
2015
TV
Cunning Single Lady
as Gook Seung-hyun
2014
TV
WATCHER
as Kim Young-Koon
2019
TV
The Third Charm
as On Joon Young
2018
TV
Entertainer
as Lee Sang-Won
2016
TV
Home Alone
as Self
2013
TV
Hwajung
as Hong Joo-won
2015
TV
What Happens to My Family?
as Yoon Eun-Ho
2014
TV
Entourage
as Cha Young-Bin
2016
TV
Law of the Jungle
2011