Seo Kang-joon
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).
TV Shows(28)
A Love Other Than Yours
Namgung Ho
Boyfriend on Demand
Seo Eun-ho
Undercover High School
Jeong Hae-sung
Grid
Kim Sae-ha
When the Weather Is Fine
Im Eun-seop
WATCHER
Kim Young-Koon
Are You Human?
Nam Shin / Nam Shin III
The Third Charm
On Joon Young
Busted!
Kang-Joon Seo
Idol Fever
Do Yun's older brother
Cheese in the Trap
Baek In-ho
Entourage
Cha Young-Bin
Entertainer
Lee Sang-Won
Hwajung
Hong Joo-won
To Be Continued
Ah-rin's elder brother
Cunning Single Lady
Gook Seung-hyun
Roommate
Self
What Happens to My Family?
Yoon Eun-Ho
The Best Future
Choi Go
The Suspicious Housekeeper
Choi Soo Hyuk