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