Black Pearl (Hangul: 블랙펄) was a South Korean girl group official made up of Oh Nami, Hwl Eun, Young Joo, and Mikka.
 When the group debuted in 2007 they marketed as the new girl group to dominate the girl group charts in the following years of 2007 and 2008 alongside some artist Wonder Girls, and Kara.
 They were also known to follow the steps of SG Wannabe, SeeYa, and M2M.
 In 2009 Mikka left due to personal reasons.
 New member Jung Min was added by 2010 or 2011.
 As for the 2010 and therefore the group only consisted of the following 4 until their disbandment in 2012.
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.
Jessica Jung (born April 18, 1989), known professionally as Jessica, is an American singer, songwriter, actress, model, fashion designer, and businesswoman currently based in South Korea.
 Jung was born and raised in San Francisco, California.
 At the age of eleven, she was discovered by South Korean entertainment agency S.M. Entertainment and subsequently moved to South Korea.
 In 2007, Jung debuted as a member of the South Korean girl group Girls' Generation.
 The group later became one of the best-selling artists in South Korea, and one of South Korea's most popular girl groups nationwide and worldwide.
"Kiss" (Korean: 입맞춤) is a dance single performed by South Korean idol singer Sandara Park, a visual and member of the girl group 2NE1.
 The song was used as part of a promotional campaign for Cass Beer.
 It features the vocals of her co-member, CL of South Korean girl group 2NE1.
 The song was released as her first official single in South Korea and was later included in the album "To Anyone".
Flower Bud is the second extended play (EP) by South Korean girl group GFriend.
 It was released by Source Music on July 23, 2015 and distributed by KT Music.
 The album contains four songs, including the single "Me Gustas Tu", and one instrumental track.
 The album debuted at number six on the Gaon Album Chart and has sold more than 18,000 units.
 Musically, the album is in the bubblegum pop genre and is similar in style to Korean girl groups of the 1990s.
 Most of the tracks on the album were written by Iggy and Seo Yong-bae, who worked with the group on their debut album, "Season of Glass".
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.
The Swindlers is an upcoming South Korean crime drama film directed by Jang Chang-won.
 The film stars Hyun Bin, Yoo Ji-tae, Bae Seong-woo, Park Sung-woong, Nana and Ahn Se-ha.
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.
Jewelry (Korean: 쥬얼리 ) was a South Korean girl group formed in 2001 by Star Empire Entertainment.
 The group was the longest-running Korean girl group (with more than 2 members) until their disbandment in 2015, surpassing super-group Baby V.O.X.
Im Jin-ah (born September 14, 1991), better known by her stage name Nana, is a South Korean singer, actress and model.
 She is a member of the South Korean girl group After School and its subgroup Orange Caramel".

Question: To what South Korean girl group does one of the actors in "The Swindlers" belong?
Answer: After School