Seo Kang-joon
Acting
Born: 1993-10-12 in Gunpo, Gyeonggi, South Korea
Biography
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).
Known For
Are You Human?
Nam Shin / Nam Shin III
The Beauty Inside
Woo-jin 92
Running Man
A Year-End Medley
Yi-kang
Boyfriend on Demand
Seo Eun-ho
Cheese in the Trap
Baek In-ho
Good Doctor
One of the punks who wants to beat Shi On
When the Weather Is Fine
Im Eun-seop
Grid
Kim Sae-ha
Undercover High School
Jeong Hae-sung
Busted!
Kang-Joon Seo
My Love, My Bride
Joon-soo
To the Beautiful You
One of the guys putting ghost makeup on Song Jong Min's group
The Best Future
Choi Go
To Be Continued
Ah-rin's elder brother
Cunning Single Lady
Gook Seung-hyun
WATCHER
Kim Young-Koon
The Third Charm
On Joon Young
Entertainer
Lee Sang-Won
Home Alone
Self
Hwajung
Hong Joo-won
What Happens to My Family?
Yoon Eun-Ho
Law of the Jungle
Entourage
Cha Young-Bin
Roommate
Self
KBS Drama Special
The Suspicious Housekeeper
Choi Soo Hyuk
After School: Lucky or Not
A Love Other Than Yours
Namgung Ho
Summer Snow
Sang-gyu
Idol Fever
Do Yun's older brother
Bomi's Room
Self
Haneuljae’s Murder
尹河
Melon Music Awards
Messenger