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