Yu Seong-Ju: South Korean Actor Profile and Filmography

Yu Seong-Ju (Hangul: 유성주) is a South Korean actor known for his extensive supporting roles across television dramas and feature films.

Yu Seong-Ju portrait photograph — Yu Seong-Ju

Career and Filmography

Yu has appeared in numerous notable South Korean television series and films, often portraying authoritative figures, professionals, and antagonists. His television credits include prominent roles in widely viewed dramas such as SKY Castle (2018–2019), Chief of Staff (2019), Squid Game (2021), and Juvenile Justice (2022).

Selected Film Credits

Steel Rain 2: Summit (2020) - 7th Division Army Commander
Voice of Silence (2020) - Il-Gyu
Pawn (2020) - Choi Man-Sik
My Big Mama's Crazy Ride (2021) - Yoo Han-Il
Hopeless (2023) - Jung-Deok
Noryang: Deadly Sea (2023) - Sim-Ri
Land of Happiness (2024) - Kim Young-Il
Seeking the King (2024)

Selected Television Drama Credits

SKY Castle (JTBC, 2018–2019) - Park Soo-Chang
Chief of Staff (JTBC, 2019) - Lee Chang-Jin
Squid Game (Netflix, 2021) - Byeong-Ki
The Silent Sea (Netflix, 2021) - Mr. Hwang
Juvenile Justice (Netflix, 2022) - SY Chemicals Chairman (ep.4)
The Bait (Coupang Play, 2023) - Park Sang-Do
Duty After School (TVING, 2023) - Cha Moon-Hyeok (ep.5)
The Midnight Studio (ENA, 2024) - Lee Hyun-Oh
When The Phone Rings (MBC, 2024-2025) - Paik Ui-Yong
The Murky Stream (Disney+, 2025) - Choi Jeong-Yeop
See You at Work Tomorrow (tvN, 2026) - Cha Young-Mok