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Seo Young-joo Filmography
| 2025 | Hallan · as Lee Cheol |
| 2024 | I, the Executioner · as Fake Haechi |
| 2024 | BEGINS ≠ YOUTH (TV Series) · as Kim Do-Geon |
| 2023 | Open the Door · as Chi-Hoon |
| 2023 | The Killing Vote (TV Series) · as Kim Ji-Hoon |
| 2023 | Tale of the Nine Tailed 1938 (TV Series) · as Satori |
| 2022 | Open the Door · as Chi-Hoon |
| 2022 | Confession · as Han Seon-Jae |
| 2020 | Ten Months · as Yoon-Ho |
| 2020 | Tale of the Nine Tailed (TV Series) · as Satori |
| 2020 | Lingering · as Sang-Woo |
| 2020 | Nobody Knows (2020) (TV Series) · as Kim Tae-Hyung |
| 2019 | Rookie Historian Goo Hae-Ryung (TV Series) · as Lee Seung-Hoon |
| 2019 | Beautiful World (TV Series) · as Han Dong-Soo |
| 2018 | Dong-hwa · as Dong-Hwa |
| 2017 | Girls' Generation 1979 (TV Series) · as Bae Dong-Moon |
| 2016 | Solomon's Perjury (TV Series) · as Lee So-Woo |
| 2016 | The Age of Shadows · as Joo Dong-Sung |
| 2015 | I Remember You (TV Series) · as Lee Jung-Ha |
| 2015 | The Treacherous · as Young Im Sung-Jae |
| 2015 | Snowy Road · as Young-Ju |
| 2014 | Lucy · as Jang's Lieutenant |
| 2013 | Golden Rainbow (TV Series) · as Kim Man-Won (young) |
| 2013 | |
| 2012 | Juvenile Offender · as Jang Ji-Gu |
| 2012 | May Queen (TV Series) · as Jang Il-Moon (young) |
| 2012 | The Thieves · as Young Macao Park |
| 2012 | Fashion King (TV Series) · as Young Kang Young-Gul |
| 2011 | Gye Baek: Warrior's Fate (TV Series) · as Gyo-Ki (teen) |
| 2011 | Can You Hear My Heart (TV Series) · as Jang Joon-Ha / Bong Ma-Roo (young) |
| 2010 | Bloody Innocent · as 11-Year-Old Dong-Sik |
| 2010 | KBS Drama Special (TV Series) · as Seok-Ju |
| 2009 | Hero (TV Series) · as Young Jin Do-Hyuk |
| 2008 | A Frozen Flower · as Young Han-Baek |