"Why So Lonely" is a song recorded by South Korean girl group Wonder Girls.
 It was released as a CD and digital single by JYP Entertainment on July 5, 2016, distributed by KT Music.
 The song is a reggae-pop dance track written by members Hyelim, Sunmi, and Yubin, with songwriter Hong Ji-sang.
 The single has two B-sides, "To the Beautiful You" and "Sweet & Easy"; the former was released on limited edition vinyl on June 18, 2016.
 To promote the single, Wonder Girls performed "Why So Lonely" on South Korean music programs, winning awards on "The Show", "M!
 Countdown", "Inkigayo", and "Music Bank".
Trouble Maker (Korean: 트러블메이커 ) is the debut extended play of South Korean duo Trouble Maker consisting of 4minute's Hyuna and Beast's Hyunseung.
Trouble Maker () is a duo formed by Cube Entertainment in 2011, composed of Kim HyunA and Jang Hyun-seung.
Kim Hyun-ah (born June 6, 1992), better known by the mononym Hyuna, stylized as HyunA, is a South Korean singer, dancer, songwriter and model.
 She rose to fame in the late 2000s as a member of the girl group Wonder Girls, leaving the ensemble shortly after their debut in 2007 and subsequently joining the girl group 4Minute in 2009.
 Hyuna began a solo career in 2010, which she describes as "performance-oriented music".
 Her debut single "Change" peaked at #2 on the Gaon Digital Chart.
Chemistry is the second extended play from South Korean duo Trouble Maker, which consists of 4Minute's Hyuna and Beast's Hyunseung.
 It was released digitally on October 28, 2013 with the lead single "Now" (Hangul: 내일은 없어 ; RR: "Naeireun Eopseo " ; lit.
 "No Tomorrow").
Trouble Maker is the ninth studio album by the American punk rock band Rancid, released on June 9, 2017.
 Like many of Rancid's albums, "Trouble Maker" was produced by Epitaph founder and Bad Religion guitarist Brett Gurewitz, and marks the band's first album since their 1993 self-titled debut to feature the original Rancid logo on the cover.
 The band recorded the album between December 2015 and January 2017 at Big Bad Sound, Sunset Sound, and Red Star.
Wonder World is the second studio album by South Korean pop girl group Wonder Girls.
 It was released on November 7, 2011.
 It was produced by Park Jin-Young.
 "Be My Baby" served as the lead single from album.
 Both album and single were commercial success.
 Album was promoted with a "Wonder World Tour" in 2012.
 Members were more involved in songwriting in production: Park Yeeun wrote and produced "G.N.O." and "Me, In", Kim Yubin wrote "Girls Girls", "Me, In" and "Sweet Dreams" while Woo Hyelim wrote and produced her solo song "Act Cool", featuring San E.
 Members also recorded duets: Min Sunye and Yeeun recorded "Long Long Time" while Yubin and Ahn Sohee recorded "SuperB".
Reboot (stylized as REBOOT) is the third and final studio album by South Korean girl group Wonder Girls.
 It was released on August 3, 2015 through JYP Entertainment.
 The Wonder Girls were more involved in the composition of this album, with each member having some writing and/or production credits on each song.
 This is the first album in years to feature member Sunmi and the first since the departure of members Sunye and Sohee.
The Wonder Girls World Tour was a 20-show tour by the Wonder Girls that took place in the US and Canada.
 The tour showcased the English and Korean versions of their hits, covers of popular English-language songs, and new songs from their album "2 Different Tears".
Rancid is the eponymously titled debut studio album by the American punk rock band Rancid.
 It was released on May 10, 1993, through Epitaph Records.
 It is the only album not to feature Lars Frederiksen on guitar, who joined while the band was touring in support of it.
 It was the second of three self-titled releases, the others being the group's debut extended play (1992) and its fifth studio album (2000).
 The album is also known as "Rancid Rancid."
 Until 2017's "Trouble Maker", this was the only Rancid album not to feature their iconic logo on the cover.

Question: Trouble Maker is an album released by a duo consisting partly of which member of the Wonder Girls?
Answer: Hyuna