Question: Full Moon is the debut extended play by a singer that was a former member of what South Korean girl group?
Context: Code#01 Bad Girl (Korean: Code#01 나쁜여자 ) is the debut extended play by South Korean girl group Ladies' Code.  It was released on March 7, 2013 through Polaris Entertainment and CJ E&M Music.  Its lead single "Bad Girl" was released the same day. Don't Say No is the debut extended play by South Korean singer Seohyun.  It was released by S.M. Entertainment on January 17, 2017.  The EP marked the official solo debut of Seohyun, who had been known as a member of South Korean girl group Girls' Generation for ten years. 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. I Just Wanna Dance is the debut extended play by South Korea-based American singer Tiffany.  It was released by S.M. Entertainment on May 11, 2016.  Lee Soo-man, former president of S.M. Entertainment, served as executive producer on the EP.  The EP marked the official solo debut of Tiffany after having been known as a member of South Korean girl group Girls' Generation for nearly nine years.  Musically, the record is a primarily synthpop album with elements of trap and R&B that draws heavy influence from American female artists of the 1990s. Venus is the debut extended play by South Korean girl group Hello Venus.  It was released on May 9, 2012, by Tricell Media and distribuited by NHN Bugs.  "Venus" was released as the title track from the EP, and the group performed the song on South Korean music programs, including "Music Bank" and "Inkigayo".  A music video for the title track was also released on May 9. Oh My Girl is the debut extended play (EP) by South Korean girl group Oh My Girl.  It was released by WM Entertainment on April 20, 2015 and distributed by LOEN Entertainment.  The album was produced by Lee Won-min, CEO of WM Entertainment, with music produced by 72 and Moon Jeong-gyu.  The album contains four songs, including the single "Cupid", which was released in conjunction with the album. Lee Sun-mi (born May 2, 1992), referred to as Sunmi, is a South Korean singer.  She debuted in 2007 as a member of South Korean girl group Wonder Girls and left from the group in January 2010 to pursue her academic career. Dreaming is the debut extended play by South Korean girl group, April.  The album was released digitally and physically on August 24, 2015 and contains six tracks with the lead single, "Dream Candy".  It is the group only release with former member Somin, who officially departed from the group on November 9, 2015 due to her wish of continuing with her studies. Full Moon is the debut extended play by South Korean singer Sunmi.  It was released by JYP Entertainment on February 17, 2014. The discography of the South Korean girl group April consists of three extended plays, and seven singles. APRIL was formed by DSP Media in 2015, and is currently composed of six members: Chaekyung, Chaewon, Naeun, Yena, Rachel and Jinsol.  The group's debut extended play, "Dreaming" was released on August 24, 2015 along with its title tracks, "Dream Candy" .  On April 27, 2016, their second EP, "Spring" was released along with the title track "Tinkerbell".  Their third EP, "Prelude" was released on January 4, 2017 along with its title track "April Story" which marked as their first activity in 2017.
Answer: Wonder Girls