Seo. Seo Yea-ji (Korean: 서예지; born April 6, 1990) 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), thriller Last (2015), and fantasy Moorim School: Saga of the Brave (2016). Her notable lead roles in television series include Save Me (2017) and Lawless Lawyer (2018). She rose to prominence with the romantic comedy It's Okay to Not Be Okay (2020).