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).
Filmography (34 titles)
ShowA Love Other Than Yours
Namgung Ho · 2026
8.3ShowBoyfriend on Demand
Seo Eun-ho · 2026
8.0ShowUndercover High School
Jeong Hae-sung · 2025
7.0ShowGrid
Kim Sae-ha · 2022
7.2MovieA Year-End Medley
Yi-kang · 2021
7.3ShowWhen the Weather Is Fine
Im Eun-seop · 2020
7.9ShowWATCHER
Kim Young-Koon · 2019
6.2ShowThe Third Charm
On Joon Young · 2018
8.1ShowAre You Human?
Nam Shin / Nam Shin III · 2018
7.8ShowBusted!
Kang-Joon Seo · 2018
1.0ShowIdol Fever
Do Yun's older brother · 2017
7.7ShowEntourage
Cha Young-Bin · 2016
6.6ShowEntertainer
Lee Sang-Won · 2016
7.0ShowCheese in the Trap
Baek In-ho · 2016
7.0MovieSummer Snow
Sang-gyu · 2015
7.6MovieThe Beauty Inside
Woo-jin 92 · 2015
5.5ShowTo Be Continued
Ah-rin's elder brother · 2015
4.5ShowHwajung
Hong Joo-won · 2015
7.4ShowThe Best Future
Choi Go · 2014
6.9MovieMy Love, My Bride
Joon-soo · 2014
MovieBomi's Room
Self · 2014
7.8ShowWhat Happens to My Family?
Yoon Eun-Ho · 2014
8.2ShowRoommate
Self · 2014
7.5ShowCunning Single Lady
Gook Seung-hyun · 2014
MovieHaneuljae’s Murder
尹河 · 2013
5.0ShowThe Suspicious Housekeeper
Choi Soo Hyuk · 2013
4.7ShowAfter School: Lucky or Not
2013
8.0ShowGood Doctor
One of the punks who wants to beat Shi On · 2013
7.5ShowHome Alone
Self · 2013
6.9ShowTo the Beautiful You
One of the guys putting ghost makeup on Song Jong Min's group · 2012