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).

Known For

Running Man

KBS Drama Special

Home Alone

Law of the Jungle

Undercover High School

Busted!

Boyfriend on Demand

Hwajung

All Movies (6)

• A Year-End Medley2021 · as Yi-kang
• Summer Snow2015 · as Sang-gyu
• The Beauty Inside2015 · as Woo-jin 92
• My Love, My Bride2014 · as Joon-soo
• Bomi's Room2014 · as Self
• Haneuljae’s Murder2013 · as 尹河

All TV Shows (28)

• A Love Other Than Yours2026 · as Namgung Ho
• Boyfriend on Demand2026 · as Seo Eun-ho
• Undercover High School2025 · as Jeong Hae-sung
• Grid2022 · as Kim Sae-ha
• When the Weather Is Fine2020 · as Im Eun-seop
• WATCHER2019 · as Kim Young-Koon
• The Third Charm2018 · as On Joon Young
• Are You Human?2018 · as Nam Shin / Nam Shin III
• Busted!2018 · as Kang-Joon Seo
• Idol Fever2017 · as Do Yun's older brother
• Entourage2016 · as Cha Young-Bin
• Entertainer2016 · as Lee Sang-Won
• Cheese in the Trap2016 · as Baek In-ho
• To Be Continued2015 · as Ah-rin's elder brother
• Hwajung2015 · as Hong Joo-won
• The Best Future2014 · as Choi Go
• What Happens to My Family?2014 · as Yoon Eun-Ho
• Roommate2014 · as Self
• Cunning Single Lady2014 · as Gook Seung-hyun
• The Suspicious Housekeeper2013 · as Choi Soo Hyuk
• After School: Lucky or Not2013
• Good Doctor2013 · as One of the punks who wants to beat Shi On
• Home Alone2013 · as Self
• To the Beautiful You2012 · as One of the guys putting ghost makeup on Song Jong Min's group
• Law of the Jungle2011
• Running Man2010
• KBS Drama Special2010
• Melon Music Awards2009 · as Messenger