Question: Which South Korean actress appeared in both Gyebaek (2011) and Emergency Couple (2014)?
Context: Gyebaek () is a 2011 South Korean period ("costume") drama series, starring Lee Seo-jin, Cho Jae-hyun, Song Ji-hyo and Oh Yeon-soo .  It aired on MBC from July 23 to November 22, 2011 on Mondays and Tuesdays at 21:55 for 32 episodes.Gyebaek lives and continues his life in Silla. Park Min-ha (born July 2, 2007) is a South Korean actress.  Park began her career as a child actress in 2011, and has appeared in such productions as the South Korean disaster film "Flu" (2013), the Korean drama television series "King of Ambition" (2013), and the music video for K.Will's song "Love Blossom" (2013).  Her father is SBS anchorman Park Chan-min. Lee Seo-jin (born January 30, 1971) is a South Korean actor and television host.  He is best known for the reality shows "Three Meals a Day" and "Grandpa Over Flowers".  As an actor he came to prominence with his leading roles in the historical dramas "Damo" (2003), "Yi San" (2007), "Gyebaek" (2011), and the contemporary drama "Marriage Contract". Choi Jin-hyuk (Hangul: 최진혁 , born Kim Tae-ho on February 9, 1986) is a South Korean actor.  He is best known for his roles in the television series "Gu Family Book", "The Heirs" and "Emergency Couple". Cheon Soo-yeon (born Cheon Seong-im on August 15, 1981), better known by her stage name Song Ji-hyo, is a South Korean actress and model.  She made her acting debut in "Wishing Stairs" (2003), one of the horror "Whispering Corridors film series".  She then received further recognition for her roles in the romantic comedy drama "Princess Hours" (2006), the historical drama "Jumong" (2006), the historical film "A Frozen Flower" (2008), the crime film "New World" (2013), the romantic comedy drama "Emergency Couple" (2014), and family melodrama "My Wife's Having an Affair this Week" (2016). Emergency Couple (; lit.  "Emergency Man and Woman") is a 2014 South Korean television series starring Song Ji-hyo and Choi Jin-hyuk with Lee Pil-mo, Choi Yeo-jin and Clara.  It aired on cable channel tvN from January 24 to April 5, 2014 on Fridays and Saturdays at 20:40 for 21 episodes.  The romantic comedy/medical drama is about a divorced couple whose tumultuous feelings for each other are rekindled when they become reunited years later as interns at the same hospital. Lee Da-hae, or Lee Da-hey (born Byun Da-hae on April 19, 1984) is a South Korean actress.  She is best known for her roles in Korean dramas such as "My Girl" (2005), "Green Rose" (2005), "The Slave Hunters" (2010), "Miss Ripley" (2011), and "Hotel King" (2014), as well as the Chinese dramas "Love Actually" (2012) and "Best Couple" (2016). Choi Jong-hwan (Hangul: 최종환 ; born September 24, 1965) is a South Korean actor.  Choi won Producer's Award for his role in "Gyebaek" and "The Duo" at the MBC Drama Awards in 2011. Han Ye-seul (born Leslie Kim on 18 September 1981) is an American-born South Korean actress.  She made her acting debut in the sitcom "Nonstop 4" (2003), and has since played leading roles in television dramas such as "Couple or Trouble" (2006), "Tazza" (2008), "Spy Myung-wol" (2011) and "Birth of a Beauty" (2014), as well as the films "Miss Gold Digger" (2007) and "Penny Pinchers" (2011). Shim Eun-ha is a retired South Korean actress.  Shim rose to popularity in the 1990s, starring in some of the highest-rated Korean dramas of all time, such as "The Last Match", "M" and "Trap of Youth".  But she is best known for her acclaimed performance in Hur Jin-ho's melodrama "Christmas in August", for which she swept the Best Actress awards in 1998.  This was followed by another well-received turn in romantic comedy "Art Museum by the Zoo".  Shim suddenly retired from show business at the height of her fame in 2001, and her mystique solidified her status as the most beloved South Korean actress of that decade.
Answer: Song Ji-hyo