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