Question: Age of Youth, is a South Korean television series stars include Ryu Hwa-young, a South Korean singer and actress, and is a former member of which South Korean girl group?
Context: Kwon So-hyun (born August 30, 1994), is a South Korean singer and actress.  She was known as a member of the South Korean girl group 4Minute, under Cube Entertainment.  She is also a former member of the South Korean girl group, Orange.  Before June 15, 2016 (end of her contract with Cube), Sohyun left 4Minute and the record label along with members Nam Ji-hyun, Heo Ga-yoon, and Jeon Ji-yoon. Lee Ji-yeon (born February 18, 1984), better known by her stage name Lina is a South Korean singer and musical actress.  She debuted in 2002 as a member of South Korean R&B duo Isak N Jiyeon and disbanded in 2004.  She later re-debut as a member of South Korean girl group The Grace in 2005 and the group currently being inactive.  She currently active as a musical actress. Age of Youth () is a South Korean television series starring Han Ye-ri, Han Seung-yeon, Park Eun-bin, Ryu Hwa-young and Park Hye-soo.  It replaced "Mirror of the Witch" and aired on cable network JTBC on Fridays and Saturdays at 20:30 (KST) for 12 episodes from July 22 to August 27, 2016. GP Basic (Korean: 지피 베이직 ) was a South Korean girl group who debuted on August 15, 2010.  At the time of their debut, they were considered to be the "youngest" South Korean girl group with an average age of below 13.5.  The age of their youngest member, Janey, caused controversy followed by the debut of a much younger girl group, G-story, who were all below 10 years old.  This led to new broadcasting regulations in South Korea. Han Sun-hwa (born October 6, 1990), is a South Korean singer and actress.  She is a former member of the South Korean girl group Secret.  She made her television debut in 2004 while participating in SBS's "Superstar Survival" as a finalist, and in 2009, she was a regular cast on a variety show called "Invincible Youth".  Aside from music, she also ventured into acting and made her debut in the 2010 drama, "More Charming By The Day".  She also acted in several dramas with supporting roles in "Ad Genius Lee Tae-baek", "God's Gift - 14 Days", and "Marriage, Not Dating".  In 2014 she finally starred as a lead actress on MBC's weekend drama "Rosy Lovers" as Baek Jang Mi co-starring with actor Lee Jang Woo.  CNN International Seoul listed Sunhwa as one of the nine rising "It" stars in Korean entertainment citing her as a "multi-tasking" artist.  Her portrayal of Kang Se-Ah in the 2014 TVN drama, "Marriage, Not Dating" earned her a nomination for "Best Youth Actress" at the 16th Seoul International Youth Film Festival.  In 2014, her portrayal of Jang-Mi from "Rosy Lovers" and Jenny from "God's Gift 14 Day"s won her two best new actress awards from MBC and SBS Drama Awards.  It was confirmed on September 26, 2016 that Sunhwa had not renewed her contract with TS Entertainment and will officially part ways in October.  On October 14, 2016 Sunhwa joined Huayi Brothers as an actress. Ryu Hwa-young (born April 22, 1993), better known by the mononym Hwayoung, is a South Korean singer and actress.  She is a former member of South Korean girl group T-ara. Kim Chung-ha (born Kim Chan-mi on February 9, 1996), better known by the mononym Chungha, is a South Korean singer.  She is best known for finishing fourth in Mnet's girl group survival show "Produce 101" and as a former member of the now disbanded South Korean girl group I.O.I. Kim Yu-jin (born April 9, 1988), better known by her stage name Uee (sometimes romanized as U-ie ), is a South Korean singer and actress.  She is best known for being a former member of South Korean girl group After School from 2009 to 2017, and has acted in various television dramas including "Queen Seondeok" (2009), "Ojakgyo Family" (2011), "Jeon Woo-chi" (2012), "Golden Rainbow" (2013), "High Society" (2015) and "Marriage Contract" (2016).  On May 31, 2017, Uee graduated and left After School and its agency, Pledis Entertainment and now under Yuleum Entertainment. Kim Da-som (born May 6, 1993), better known mononymously as Dasom, is a South Korean singer and actress.  She is best known as a former member of South Korean girl group Sistar under Starship Entertainment.  She has acted in films and television dramas, including "Family" (2012–2013), "Melody of Love" (2013–2014) and "The Virtual Bride" (2015). Goo Ha-ra (born January 13, 1991), better known mononymously as Hara, is a South Korean singer and actress.  She is a former member of the South Korean girl group Kara, and has also appeared in television dramas including "City Hunter" (2011).  She made her debut as a soloist in July 2015 with the release of her EP "Alohara (Can You Feel It?) ".
Answer: T-ara