Ko A-sung (born 10 August 1992) is a South Korean actress. She began her career as a child actress, notably in 2006 top-grossing blockbuster The Host. This was followed by major roles in Snowpiercer (2013), Thread of Lies (2014) and Office (2015), as well as the TV dramas Master of Study (2010) and Heard It Through the Grapevine (2015).
| Movie | The Host : Histoires de famille | Go A-sung | 2027 |
| Series | The Miracles of the Namiya General Store | Unknown | 2027 |
| Series | I Am Also a Film Director | Unknown | 2027 |
| Movie | Nervous | Unknown | 2027 |
| Movie | Pavane | Mi-jung | 2026-02-19 |
| Movie | Time of Cinema | Unknown | 2026-03-18 |
| Series | 21c Woman Shelter | Self - Host | 2026-05-31 |
| Series | Edward Lee's Country Cook | Self | 2025-02-14 |
| Series | 인생이 영화 | Unknown | 2025-04-12 |
| Movie | Because I Hate Korea | Joo Kye-na | 2024-08-28 |
| Series | The Seasons | Self | 2023-02-05 |
| Series | Salon Drip | Self | 2023-03-23 |
| Series | Doona! | Ha-yeon | 2023-10-20 |
| Movie | Honeysweet | Serenade Woman | 2023-08-15 |
| Series | Tracer | Seo Hey-young | 2022-01-07 |
| Series | SNL Korea | Self - Host | 2021-09-04 |
| Series | Next Entertainment, Visionary | Self | 2021-01-18 |
| Series | Crime Puzzle | Yoo-hee | 2021-10-29 |
| Series | Show!terview with Jessi | Self | 2020-06-11 |
| Series | K-Ocean Pathfinders | Unknown | 2020-10-18 |
| Movie | Samjin Company English Class | Lee Ja-young | 2020-10-21 |
| Movie | A Resistance | Yu Gwan-sun | 2019-02-27 |
| Series | Amazing Saturday | Self | 2018-04-07 |
| Series | Life on Mars | Yoon Na-Young | 2018-06-09 |
| Movie | The King | Miss Kim | 2017-01-18 |
| Series | Radiant Office | Eun Ho-Won | 2017-03-15 |
| Movie | A Melody to Remember | Park Joo-mi | 2016-01-21 |
| Series | Midnight Diner: Tokyo Stories | Yoona | 2016-10-21 |
| Series | Heard It Through the Grapevine | Seo Bom | 2015-02-23 |
| Movie | The Beauty Inside | Woo-jin 101 | 2015-08-20 |
| Movie | Office | Lee Mi-rye | 2015-09-03 |
| Movie | Right Now, Wrong Then | Yeom Bora | 2015-09-24 |
| Movie | Thread of Lies | Lee Man-ji | 2014-03-13 |
| Movie | Snowpiercer International Special Animation | Yona (voice) | 2013-07-18 |
| Movie | Snowpiercer | Yona | 2013-08-01 |
| Movie | Duet | Nancy | 2012-04-19 |
| Series | Baeksang Arts Awards | Self | 2012-04-26 |
| Movie | 3.11 A Sense of Home Films | Unknown | 2011-09-11 |
| Series | Master of Study | Gil Pul-ip | 2010-01-04 |
| Series | Running Man | Unknown | 2010-07-11 |
| Movie | A Brand New Life | Ye-shin | 2009-10-29 |
| Series | You Hee-yeol's Sketchbook | Self | 2009-04-24 |
| Movie | After the Banquet | Mi-rae | 2009-12-03 |
| Movie | Radio Dayz | Sun-deok | 2008-01-31 |
| Movie | The Happy Life | Joo-hee | 2007-09-12 |
| Movie | The Host | Park Hyun-seo | 2006-07-27 |
| Series | Sad Love Story | Unknown | 2005-01-05 |
| Series | 울라불라 블루짱 | Noh Da-ji | 2004-03-02 |
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