Question: What EP was released in 2016 by a girl group, of which one member was also known for playing the main character in the drama "School 2017'?

Context articles: Kim Se-jeong
Page Two (EP)
EXID
Lee Hae-in (singer)
Twicecoaster: Lane 1
Black Pearl (K-Pop Group)
D.Holic
I.O.I
List of songs recorded by Fifth Harmony
Twice discography

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".
Page Two is the second extended play (EP) by South Korean girl group Twice.
 The album was released digitally and physically on April 25, 2016 by JYP Entertainment and distributed by KT Music.
 It contains seven tracks, including the lead single, "Cheer Up".
 "Page Two" has the most first-week sales out of all K-pop girl group releases in 2016.
EXID ( ; ; short for "Exceed in Dreaming"), is a South Korean girl group formed in 2012.
 The group consists of five members: Solji (currently on hiatus due to health issues), LE, Hani, Hyelin and Jeonghwa.
 They made their debut as a six-member group in February 2012, with the single "Whoz That Girl".
 Their first EP "Hippity Hop" was released in August 2012 to limited success.
 The group unexpectedly gained success after their 2014 single "Up & Down".
 The single did not chart well upon initial release, but reached number one on the Gaon Singles Chart four months later, when a fan-recording of one of EXID's performances of the song became a viral video.
 EXID released their second EP "Ah Yeah" in April 2015, to commercial success.
 Their first studio album entitled "Street", was released in June 2016.
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.
Twicecoaster: Lane 1 (stylized as TWICEcoaster : LANE 1) is the third extended play (EP) by South Korean girl group Twice.
 The EP was released digitally and physically on October 24, 2016 by JYP Entertainment and distributed by KT Music.
 It contains seven tracks, including the lead single "TT" (refers to the emoticon used to express crying or sadness).
 The EP is the highest selling K-pop girl group album of 2016, which sold 350,852 units at year-end.
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.
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).
I.O.I (; also known as IOI or Ideal of Idol) was a South Korean girl group formed by CJ E&M through the 2016 reality show "Produce 101" on Mnet.
 The group was composed of eleven members chosen from a pool of 101 trainees from various entertainment companies: Lim Na-young, Kim Chung-ha, Kim Se-jeong, Jung Chae-yeon, Zhou Jieqiong, Kim So-hye, Yu Yeon-jung, Choi Yoo-jung, Kang Mi-na, Kim Do-yeon and Jeon So-mi.
 They debuted on May 4, 2016 with the EP "Chrysalis" and actively promoted as a whole and as a sub-unit for less than a year.
Fifth Harmony is an American four-piece girl group, consisting of members Ally Brooke, Normani Kordei, Dinah Jane, Lauren Jauregui and formerly Camila Cabello.
 The group began working on their debut EP, "Better Together".
 It was released in 2013, following their exit from the second season of the American televised singing competition, "The X Factor".
 At this time, the group contributed guest vocals on two covers, "When I Was Your Man" by Bruno Mars and "Mirrors" by Justin Timberlake, for Boyce Avenue's cover EP, "Cover Collaborations, Volume 2".
 The first single released from their debut EP, "Better Together", was "Miss Movin' On", a power pop song with a synth-backed chorus written by singer Julia Michaels among other writers.
 While the group had very limited songwriting credits in their EP, they are credited as writers on the promotional single, "Me & My Girls" with collaborations from Patrick James Bianco, Beau Alexandrè Dozier and John Ryan.
 Their EP was subsequently released four times with an acoustic version, a remixes EP, and two Spanish versions, one standard and one acoustic.
South Korea-based girl group Twice have released four extended plays (one of which was reissued under a different title), one compilation album, one compilation EP, and five singles.
 Formed by JYP Entertainment in 2015 through the survival show "Sixteen", Twice debuted in October 2015 with the release of their first EP, "The Story Begins", and its single "Like Ooh-Ahh".
 The EP and the single peaked at No. 3 and No. 10 on the Gaon Music Chart, respectively.
 "The Story Begins" eventually sold over 120,000 copies, becoming the best-selling debut extended play by a K-pop girl group of all time, breaking the record set by Girls' Generation's first extended play "Gee" (2009), which sold nearly 100,000 copies.