Seo Yea-ji (Korean: 서예지; also spelled as Seo Ye-ji) is a South Korean actress. She began her acting career in the sitcom Potato Star 2013QR3 (2013–2014). This was followed by major roles in period drama Diary of a Night Watchman (2014) and thriller Last (2015). Her notable lead roles in television series include Moorim School: Saga of the Brave (2016), Save Me (2017), and Lawless Lawyer (2018). She rose to prominence with the 2020 television series It's Okay to Not Be Okay.