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Song Jeong-sik (Korean: 송정식; born December 11, 1983), better known by his stage name On Joo-wan, is a South Korean actor. He won widespread praise for his leading role in the film The Peter Pan Formula, and also appeared in My Mighty Princess, 12 Signs of Love, and The Five.
| Year | Title | Role | Notes | Ref. |
| 2004 | Flying Boys | Lee Chang-seob | ||
| 2005 | The Aggressives | Jjaeng | ||
| The Peter Pan Formula | Kim Han-soo | |||
| 2006 | If You Were Me 2 | Employee | Segment: "Hey, Man!" | |
| The City of Violence | Young Tae-su | |||
| Bloody Tie | Yoo Sung-geun | |||
| 2007 | The Cut | Joong-suk | ||
| 2008 | My Mighty Princess | Il-young | ||
| 2012 | The Taste of Money | Yoon Chul/Charlie | ||
| Natural Burials – The Movie | Jung-hoon | |||
| 2013 | The Five | Oh Jae-wook | ||
| 2014 | Obsessed | Kyung Woo-jin | ||
| 2015 | Remember You | Dong-gun | ||
| Time Renegades | Teacher Park | |||
| 2020 | Honest Candidate | Kim Jun-young | ||
| 2022 | Honest Candidate 2 | Special appearance |
| Year | Title | Role | Notes | Ref. |
| 2002 | Rustic Period | Japanese student 1 | ||
| 2005 | That Summer's Typhoon | Han Ji-hoon | ||
| 2007 | Chosun Police 1 | Kim Kang-woo | ||
| 2011 | My Love By My Side | Go Seok-bin | ||
| 2012 | 12 Signs of Love | Cha Jin-oh | ||
| Natural Burials | Jung-hoon | |||
| 2013 | The Blade and Petal | Bojang of Goguryeo | ||
| 2014 | Drama Special: "Illegal Parking" | Noh Jung-do | ||
| The Idle Mermaid | Lee Hyun-myung | |||
| Punch | Lee Ho-sung | |||
| 2015 | The Time We Were Not in Love | Himself | Cameo; episode 2 | |
| The Village: Achiara's Secret | Seo Ki-hyun | |||
| 2016 | Beautiful Gong Shim | Seok Joon-soo | ||
| 2017 | Man in the Kitchen | Jung Tae-Yang | ||
| 2019 | The Lies Within | Jin Young-min | ||
| 2021 | The Penthouse: War in Life | Baek Joon-ki | Cameo (Season 2, episode 13)Series regular (Season 3) | |
| 2023 | Moon in the Day | Han Min-oh |
| Year | Title | Role | Notes | Ref. |
| 2015–2016 | Shaolin Clenched Fist | Fixed cast member as "#2" | Episodes 1–13 | |
| 2017 | King of Mask Singer | Contestant as "Young Master, Shows a Bitter Taste" | Episodes 103–104 | |
| 2020 | Sea Police 2 | Main cast | ||
| 2021 | Awesome Romance | Host |
| Year | Title | Notes | Ref. |
| 2021 | Korean Popular Culture and Arts Awards | with Jang Ye-won |
| Year | Title | Role | Notes | Ref. |
| 2008 | Lee Juck's TenTen Club | [citation needed] |
| Year | Title | Role | Notes | Ref. |
| 2016 | Newsies | Jack Kelly | ||
| 2018–2019; 2020–2021 | The Days | Kang Moo-young | ||
| 2022 | Sandglass (모래시계) | Tae-soo |
| Award ceremony | Year | Category | Nominee / Work | Result | Ref. |
| Baeksang Arts Awards | 2007 | Best New Actor – Film | The Peter Pan Formula | Nominated | |
| Blue Dragon Film Awards | 2006 | Best New Actor | The Peter Pan Formula | Nominated | |
| Dubai International Film Festival | 2006 | Best Actor | The Peter Pan Formula | Won | |
| Golden Cinematography Awards | 2007 | Best New Actor | The Peter Pan Formula | Won | |
| Korea Drama Awards | 2018 | Excellence Award, Actor | Man in the Kitchen | Won | |
| Korean Film Awards | 2006 | Best New Actor | The Peter Pan Formula | Nominated | |
| MBC Drama Awards | 2017 | Excellence Award, Actor in a Weekend Drama | Man in the Kitchen | Nominated | |
| SBS Drama Awards | 2016 | Special Acting Award, Actor in a Romantic Comedy Drama | Beautiful Gong Shim | Won | |
| 2021 | Best Character Award, Actor | The Penthouse: War in Life 2 and 3 | Nominated |