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.
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.
Scaptotrigona postica (also known locally in Brazil as mandaguari) is a species of stingless bee that lives mainly in Brazil.
 It is a eusocial bee in the tribe "Meliponini".
 "S. postica" is one of 25 species in the genus "Scaptotrigona" and is a critical pollinator of the tropical rain forests of Brazil.
 They construct their nests in hollowed sections of tree trunks, allowing for effective guarding at the nest entrance.
 This species shows colony structure similar to most members of the Meliponini tribe with three roles within the colony: queen, worker, and male.
 "S. postica" individuals have different forms of communication from cuticular hydrocarbons to pheromones and scent trails.
 Communication is especially useful during worker foraging for nectar and pollen through the Brazilian tropical rain forests.
 "S. postica" is a very important pollinator of the Brazilian tropical rain forests and is widely appreciated for its honey.
 Stingless bees account for approximately 30% of all pollination of the Brazilian Caatinga and Pantanal ecosystems and up to 90% of the pollination for many species of the Brazilian Atlantic Forest and the Amazon.
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.
A rainwater tank (sometimes called a rain barrel in North America in reference to smaller tanks, or a water butt in the UK) is a water tank used to collect and store rain water runoff, typically from rooftops via pipes.
 A rainwater catchment or collection (also known as "rainwater harvesting") system can yield 2358 litres (623 gal) of water from 2.54 cm (1 in) of rain on a 93 m (1,000 sq ft) roof.
 Rainwater tanks are devices for collecting and maintaining harvested rain.
Judith Nyambura Mwangi (born 30 April 1986), better known by her mononym Avril, is a Kenyan singer-songwriter, actress and entertainer.
 She was formerly signed to Ogopa Deejays, one of the leading music production and record labels in Kenya.
 As a singer, she is popularly known for her singles "Mama", "Kitu Kimoja", "Chokoza" and "Hakuna Yule".
 As an actress, she is best known for playing Miss B'Have on "Shuga: Love, Sex, Money" (2012).
 Avril's contribution to the Kenyan Entertainment Industry has earned her one Nzumari Award, one Kisima Music Award, one Golden Mic Award and two Chaguo La Teeniez Awards.
Vyjayanthimala Bali (born 13 August 1936), also known by the mononym Vyjayanthimala, is an Indian film actress, Bharathanatyam dancer, Carnatic singer, dance choreographer and parliamentarian.
 She was referred to as the first female superstar of Hindi cinema.
 She made her debut in the Tamil language film "Vazhkai" in 1949 and in the Telugu film "Jeevitham" in 1950.
 She later became one of the most prominent actresses of South Indian cinema and in the golden era of Bollywood and was known as one of the iconic leading actress of all time.
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).
Amanda Rose Moseley (born December 20, 1993) better known by her stage name Mandy Rain, is an American recording artist, dancer, and actress.
 Rain started her acting career at a young age.
 In 2007, Rain auditioned for Star Camp, a Nickelodeon television show that focuses on the making of a super star musical group.
 Rain was chosen along with seven other kids to join the show and The Giggle Club.
 The band disbanded shortly after the series' finale.
 Shortly afterwards, The Giggle Club's producer Nick Cannon decided to groom Rain for a solo career.
 Cannon started bringing Rain to recording studios to record songs while he was drafting a show for her called The Diaries of Mandy Rain.
 After hearing one of the tracks Rain had recorded, Cannon got inspired by it and decided to start drafting a different show about three private school girls.
 After several months, Canon formed School Gyrls.
 The original line up featured Rain, Monica Parales, and Jacque Pyles.
 In the summer of 2009, School Gyrls starred in a movie Canon had written called School Gyrls which premiered on Nickelodeon on February 21, 2010.
 Shortly afterwards, they released a self-titled album "School Gyrls".
 Later that year, they also released a holiday album titled "A Very School Gyrls Holla-Day".
 Rain and Pyles left the group shortly after the release of the holiday album to focus on their solo careers.
Yu Shi (: "Yǔ Shī"literally: "Master of Rain" ) is a Chinese spirit or god of rain, also known as or conflated with Red Pine (Chisong, 赤松, or, Chisongzi -- Master Red Pine), among other names.
 Translations of "Yu Shi" into English include "Lord of Rain" and "Leader of Rain".

Question: Which actress from Love Rain was also known by the mononym Yoona?
Answer: Im Yoon-ah