Question: This South Korean television series that premiere on July 17, 2017 stars a singer and actress who is a member of what girl group?
Context: 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. Kim Se-jeong (born August 28, 1996) is a South Korean singer and actress signed under Jellyfish Entertainment.  She is best known for finishing second in Mnet's K-pop girl group survival show "Produce 101" and is a member of girl group Gugudan.  She is a former member of I.O.I and was also a co-host of KBS2 variety show "Talents for Sale" (2016).  She is also known for playing the main character in the drama "School 2017". 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. Sunmin (Hangul: 선민, "Katakana": ソンミン, born August 4, 1987) is a South Korean singer who speaks and sings in Korean, Japanese, and English.  She debuted in 2006, with the single "Keep Holding You," a collaboration with the Japanese R&B singer Toshinobu Kubota.  Her career was initially focused on the Japanese market, but her work became focused in South Korea from 2009 to 2010.  She also contributed to original soundtracks of South Korean television series "Master of Study" and "Gloria (2010 TV series)".  In 2010 to 2011, she was in the main South Korean musical production of "Jekyll & Hyde" as Lucy.  In 2012 to 2013, she reprised her role as Lucy in the South Korean national tour.  In spring 2013, Sunmin played Josephine in the South Korean production of "Arsène Lupin", the musical. 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. School 2017 (Hangul: 학교 2017 ; RR: "Hakgyo 2017 " ) is a South Korean television series starring Kim Se-jeong, Kim Jung-hyun, , Han Sun-hwa, and Han Joo-wan.  It premiered on KBS2 on July 17, 2017 and airs every Monday and Tuesday at 22:00 KST.  The series is the seventh installment of KBS2's "School" franchise. Idol Drama Operation Team () is a 2017 South Korean television program.  The show will be on broadcast through Naver TVCast and Naver V App on every Monday, Wednesday and Friday at 11am KST.  It will later then be on broadcast through KBS Joy (KBS N) and KBS World from June 10.  The show invites 7 girl group members to create their very own Korean drama series by becoming accredited scriptwriters as well as act in the series as fictional versions of themselves.  The drama they will be working on will be named Let's Only Walk The Flower Road (), an autobiographical drama.  The first episode of the drama will be on broadcast on June 26 at 11am KST through Naver TVCast and Naver V App.  It airs daily for 8 episodes until July 3.  On July 4, each member's full performances for The Five was revealed. D.Holic (Hangul: 디홀릭) was a South Korean girl group formed by Star Road Entertainment (formerly H.Mate Entertainment) in 2014 with five members.  Nine left the group in August 2015, due to personal reasons, and was replaced by new member, Hwajung.  In July 2016, it was revealed through teasers that Danbee and Duri had decided to leave the group, new member, EJ, was added to the line-up.  In February 2017, it was confirmed through a performance that members Hami and Hwajung had departed from the group.  They were temporary replaced with new members, Nayoung and Youjin, although they never officially made their debut.  In July 2017, EJ announced that she would be leaving the group to pursue a modelling career.  The group informally disbanded after the departure of all but one member, with the aim of re-debuting the remaining member, Rena, into a new girl group within a year.  The group has released one mini-album: "Chewy" (2015) and three single albums: "D.Holic Dark With Dignity" (2014), "Murphy & Sally" (2015), and "Color Me Rad" (2016). 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 Hae-in (born July 4, 1994) is a South Korean singer and actress.  She debuted in project girl group I.B.I, a project girl group that consists of Produce 101 eliminated contestants formed by LOEN Entertainment, which debuted in August 2016.  In 2017, she joined another survival girl group show, Idol School as a contestant.
Answer: Gugudan