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).
2026A Love Other Than YoursTV showas Namgung Ho · 14 episodes2026Boyfriend on DemandTV showas Seo Eun-ho · 5 episodes2025Undercover High SchoolTV showas Jeong Hae-sung · 12 episodes
2022Just an ExcuseTV showas Self · 1 episodes2022GridTV showas Kim Sae-ha · 10 episodes2021A Year-End MedleyMovieas Yi-kang2020When the Weather Is FineTV showas Im Eun-seop · 16 episodes2019WATCHERTV showas Kim Young-Koon · 16 episodes2018The Third CharmTV showas On Joon Young · 16 episodes2018Are You Human?TV showas Nam Shin / Nam Shin III · 36 episodes2018Busted!TV showas Kang-Joon Seo · 1 episodes
2017Idol FeverTV showas Do Yun's older brother · 10 episodes
2016EntourageTV showas Cha Young-Bin · 16 episodes2016EntertainerTV showas Lee Sang-Won · 2 episodes2016Cheese in the TrapTV showas Baek In-ho · 16 episodes
2015Summer SnowMovieas Sang-gyu2015The Beauty InsideMovieas Woo-jin 922015To Be ContinuedTV showas Ah-rin's elder brother · 12 episodes
2015HwajungTV showas Hong Joo-won · 50 episodes2014The Best FutureTV showas Choi Go · 5 episodes2014My Love, My BrideMovieas Joon-soo
2014Bomi's RoomMovieas Self
2014What Happens to My Family?TV showas Yoon Eun-Ho · 53 episodes
2014RoommateTV showas Self · 46 episodes2014Cunning Single LadyTV showas Gook Seung-hyun · 16 episodes
2013Haneuljae’s MurderMovieas 尹河
2013The Suspicious HousekeeperTV showas Choi Soo Hyuk · 20 episodes
2013After School: Lucky or NotTV show24 episodes2013Good DoctorTV showas One of the punks who wants to beat Shi On · 1 episodes2013Home AloneTV showas Self · 1 episodes2012To the Beautiful YouTV showas One of the guys putting ghost makeup on Song Jong Min's group · 3 episodes
2011Law of the JungleTV show9 episodes2010Running ManTV show1 episodes
2010KBS Drama SpecialTV show1 episodes
2009Melon Music AwardsTV showas Messenger · 1 episodes
—NambeolMovie