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 | Time of Cinema | Unknown | 2026-03-18 |
| Movie | Because I Hate Korea | Joo Kye-na | 2024-08-28 |
| Movie | Honeysweet | Serenade Woman | 2023-08-15 |
| Movie | Samjin Company English Class | Lee Ja-young | 2020-10-21 |
| Movie | A Resistance | Yu Gwan-sun | 2019-02-27 |
| 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 | 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 | Yona | 2013-08-01 |
| Movie | Duet | Nancy | 2012-04-19 |
| Movie | 3.11 A Sense of Home Films | 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 |
| Movie | After the Banquet | Mi-rae | 2009-12-03 |
| Movie | Radio Dayz | Sun-deok | 2008-01-31 |
| Movie | Happy Life | Gi-yeong's daughter, Joo-hee | 2007-09-12 |
| Movie | The Host | Park Hyun-seo | 2006-07-27 |
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