Question: Which actress from Love Rain was also known by the mononym Yoona?

full_context: Document 1: Jang Keun-suk: Jang Keun-suk () is a South Korean actor and singer. He is best known for starring in the Korean television dramas "Beethoven Virus" (2008), "You're Beautiful" (2009), "Mary Stayed Out All Night" (2010), "Love Rain" (2012), "Pretty Man" (2013) and "Jackpot" (2016).
Document 2: Rain (Soyou and Baekhyun song): "Rain" (Korean: 비가와 ) is a song by South Korean singers Soyou and Baekhyun, members of K-pop groups Sistar and EXO respectively. It was released on February 14, 2017 by Starship Entertainment.
Document 3: Seohyun: Seo Ju-hyun (born June 28, 1991), known professionally as Seohyun, is a South Korean singer and actress. She debuted as a member of girl group Girls' Generation (and later its subgroup TTS) in August 2007, who went on to be one of the best-selling artists in South Korea and one of South Korea's most popular girl groups worldwide. Apart from her group's activities, she has established herself as an actress, notably through her participation in the original and Korean versions of stage musicals including "Moon Embracing the Sun", "Gone with the Wind" and "Mamma Mia". She also starred in the drama "". She debuted as a solo artist with her debut mini album, "Don't Say No", on January 17, 2017, making her the third Girls' Generation member to debut as a solo artist.
Document 4: Girls' Generation: Girls' Generation (), also known as SNSD, is a South Korean girl group formed by S.M. Entertainment. The group is composed of eight members: Taeyeon, Sunny, Tiffany, Hyoyeon, Yuri, Sooyoung, Yoona, and Seohyun. Originally a nine-piece group (with Jessica, who later departed from the group in September 2014), Girls' Generation debuted in 2007 with their Korean eponymous debut album. Though the album gained some attention, it was not until 2009 that the group rose to fame with the single "Gee", which claimed the top spot on KBS's "Music Bank" for a record-breaking nine consecutive weeks and was named the most popular song of the 2000s in South Korea by Melon. Girls' Generation further consolidated their popularity on the South Korean music scene with follow-up singles "Tell Me Your Wish (Genie)", "Oh!", and "Run Devil Run", which were released in mid-2009 and early 2010.
Document 5: Seo Yu-na: Seo Yu-na (born December 30, 1992), better known by the mononym Yuna, is a South Korean singer and actress. She is a member of the South Korean girl group AOA and its sub-groups, AOA Black and AOA Cream.
Document 6: Love Rain: Love Rain () is a 2012 South Korean television series directed by Yoon Seok-ho. Set in the seventies and the present day, it tells a love story over two generations, with Jang Keun-suk and Im Yoon-ah playing dual roles. It aired on KBS2 from March 26 to May 29, 2012 on Mondays and Tuesdays at 21:55 for 20 episodes.
Document 7: Rain (entertainer): Jung Ji-hoon (, born June 25, 1982), better known by his stage name Rain (Korean 비 IPA ['piː]), is a South Korean singer-songwriter, actor, and music producer.
Document 8: Love in the Moonlight: Love in the Moonlight () is a South Korean television series starring Park Bo-gum and Kim Yoo-jung with Jinyoung, Chae Soo-bin and Kwak Dong-yeon. It is a coming-of-age story and youth romance set during 19th-century Joseon Dynasty based on the novel "" which was first serialized on Naver in 2013 and consequently published as a five-part series of books in 2015. It aired every Monday and Tuesday from August 22, 2016 until October 18, 2016 on KBS2 at 22:00 (KST) for 18 episodes.
Document 9: Yoon Eun-hye: Yoon Eun-hye (Korean: 윤은혜; born October 3, 1984) is a South Korean actress, director, singer, entertainer and model. She debuted as a member of girl group Baby Vox, staying with the group from 1999 to 2005. Yoon has since moved on to acting and is best known for starring in the television dramas "Princess Hours" (2006), " The Vineyard Man" (2006), "The 1st Shop of Coffee Prince" (2007), "My Fair Lady" (2009) and "Missing You" (2012).
Document 10: Seohyun discography: Seohyun (born Seo Joo-hyun) is a South Korean singer, member of Girls' Generation and its subgroup Girls' Generation-TTS. Since debuting in 2007, she has collaborated with various artists and released several original soundtracks for South Korean TV series. Her career as a solo singer began in January 2017 with the release of her debut extended play "Don't Say No".
Document 11: Kim Tae-yeon: Kim Tae-yeon (born March 9, 1989), referred to as Taeyeon, is a South Korean singer. She had been a trainee at S.M. Entertainment's Starlight Academy during her middle school years before debuting as a member of the agency's girl group, Girls' Generation, in 2007. Since then, she has risen to prominence due to the group's success on the Asian music scene and further participated in the agency's projects Girls' Generation-TTS and SM the Ballad. Aside from group activities, she has also recorded songs for various television dramas and movies.
Document 12: Im Yoon-ah: Im Yoon-ah (Hangul: 임윤아 ; born May 30, 1990), better known by the mononym Yoona, is a South Korean singer and actress. She debuted as a member of girl group Girls' Generation in August 2007, who went on to become one of the best-selling artists in South Korea and one of South Korea's most popular girl groups worldwide.
Document 13: Steel Rain: Steel Rain is an upcoming South Korean action drama film directed by Yang Woo-suk, based on his webtoon of the same name. The film stars Jung Woo-sung and Kwak Do-won.
Document 14: Come Rain, Come Shine: Come Rain, Come Shine (; literally "I Love You, I Love You Not") is a 2011 South Korean film by Lee Yoon-ki. A young woman (Im Soo-jung) informs her husband of five years (Hyun Bin) that she is leaving him for another man (Ha Jung-woo), but the husband remains calm and even helps her pack. The experimental film traces in real-time parts of their last three hours together while the wife prepares to move out. The film premiered in competition at the 61st Berlin International Film Festival in 2011.
Document 15: IU (singer): Lee Ji-eun (Korean: 이지은 ; born May 16, 1993), better known by her stage name IU (Korean: 아이유 ), is a South Korean singer, songwriter and actress. While still in middle school, IU auditioned for various talent agencies with ambitions of becoming a singer. She signed with LOEN Entertainment in 2007 as a trainee and began her music career at the age of 15 with her debut album, "Lost and Found". Her follow-up albums, "Growing Up" and "IU...IM", brought her mainstream success, but it was through "Good Day" (Korean: 좋은 날 ), the lead single from her 2010 album "Real", that she achieved national stardom. "Good Day" spent five consecutive weeks at the top position of South Korea's Gaon Digital Chart and holds the record for spending the most number of weeks at No. 1 along with Psy's "Gangnam Style".
ground_truth: Im Yoon-ah