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Im Sun-woo (; born September 30, 2000), known by her stage name Yoon Seo-ah (), is a South Korean actress. She is known for her supporting role as Seo Ji-wan in the Netflix series Nevertheless.
Yoon debuted as an actress with the 2018 drama series Bad Papa, and later appeared in another series named Love Revolution. She also appeared in one episode of True Beauty, playing a teenage Lim Hee-kyung (originally portrayed by Im Se-mi).
In Nevertheless, Yoon played Seo Ji-wan, the best friend of Yoon Sol (Lee Ho-jung). With the role, the two became known as a love team, and Yoon became popular. Her performance with Lee Ho-jung was noted by allkpop.com as one of the most remarkable examples of LGBT representation in Korean drama.
Throughout 2022, Yoon portrayed guest roles such as Go Hye-rim in Juvenile Justice and Kim Seo-yeon in Soundtrack#1. She also played a supporting role as Ddong-geum in Bloody Heart. Later, she played the supporting role of Oh Nu-ri in drama Today's Webtoon.
In 2024, Yoon portrayed Chae Young-ji in the Netflix sci-fi dystopian series titled Goodbye Earth. She starred as Baek Yi in the JTBC romance historical drama titled The Tale of Lady Ok, alongside Lim Ji-yeon, Choo Young-woo, Kim Jae-won, Yeonwoo and Kim Mi-sook.
In 2025, Yoon Seo-ah stars as Seo Gil-geum in the fantasy survival romance television series titled Bon Appetit, Your Majesty, alongside Im Yoon-ah, Lee Chae-min and Kang Han-na.
| 2018 | Bad Papa | Wang Hye-ji | Guest role |
| 2019 | Nokdu Flower | Gisaeng | |
| 2020 | True Beauty | Teen Lim Hee-kyung | |
| 2021 | Nevertheless | Seo Ji-wan | |
| 2022 | Bloody Heart | Ddong-geum | |
| Today's Webtoon | On Noo-ri | ||
| 2023 | Eun Ji | Guest role (ep. 2) | |
| 2024 | The Tale of Lady Ok | Baek Yi | |
| 2025 | Bon Appetit, Your Majesty | Gil-geum |
| 2020 | Love Revolution | Bae Ji-yeon | |
| 2022 | Juvenile Justice | Go Hye-rim | Guest role (ep. 4-5) |
| Soundtrack #1 | Kim Seo-yeon | Guest role (ep. 4) | |
| 2024 | Goodbye Earth | Chae Young-ji |
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