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

Are You Human?

as Nam Shin / Nam Shin III

The Beauty Inside

as Woo-jin 92

Running Man

A Year-End Medley

as Yi-kang

Boyfriend on Demand

as Seo Eun-ho

Cheese in the Trap

as Baek In-ho

When the Weather Is Fine

as Im Eun-seop

Good Doctor

as One of the punks who wants to beat Shi On

Grid

as Kim Sae-ha

Undercover High School

as Jeong Hae-sung