Summer Nights (EP)

Summer Nights is the expanded reissue of What Is Love?, the fifth extended play release by South Korean girl group Twice. It was released on July 9, 2018, by JYP Entertainment.

Background and release
On June 7, 2018, JYP Entertainment (JYPE) confirmed that Twice was scheduled to make a comeback in July and that the music video for the lead single was filmed in Japan. Later that month, it was officially announced that Twice would release a special album titled Summer Nights, a reissue of their fifth extended play (EP) What Is Love?. The EP includes nine songs, including the six found on the original release, and three new songs, including the single, "Dance the Night Away", "Chillax" and "Shot Thru the Heart", which was written by Twice's Japanese members Momo, Sana and Mina.

A short video preview of the three new songs was released on July 8. The album, along with the music video of "Dance the Night Away", was officially released the next day on various music portals.

Promotion
On June 19, 2018, it was confirmed that Twice would guest on Idol Room, the group's first variety show for their comeback with Summer Nights.

Personnel
Credits adapted from album liner notes.


 * J. Y. Park "The Asiansoul" – producer
 * Lee Ji-young – direction and coordination (A&R)
 * Jang Ha-na – music (A&R)
 * Kim Yeo-joo (Jane Kim) – music (A&R)
 * Kim Ji-hyeong – production (A&R)
 * Cha Ji-yoon – production (A&R)
 * Choi A-ra – production (A&R)
 * Kim Bo-hyeon – design (A&R), album art direction and design
 * Kim Tae-eun – design (A&R), album art direction and design, and web design
 * Choi Jeong-eun – design (A&R) and album art direction and design
 * Lee So-yeon – design (A&R), album art direction and design, and web design
 * Seo Yeon-ah – design (A&R) and web design
 * Choi Hye-jin – recording and mixing engineer, digital editor (on "Dance the Night Away")
 * Lim Hong-jin – recording and mixing engineer
 * Eom Se-hee – recording and mixing engineer
 * No Min-ji – recording engineer
 * Tony Maserati – mixing engineer
 * James Krausse – mixing engineer
 * Lee Tae-seop – mixing engineer
 * Ko Hyeon-jeong – mixing engineer
 * Master Key – mixing engineer
 * Kwon Nam-woo – mastering engineer
 * Naive Production – video director
 * Kim Young-jo – video executive producer
 * Yoo Seung-woo – video executive producer
 * Kwak Gi-gon at TEO Agency – photographer
 * Jung Nan-young at Lulu – hair director
 * Son Eun-hee at Lulu – hair director
 * Choi Ji-young at Lulu – hair director
 * Jo Sang-ki at Lulu – makeup director
 * Zia at Lulu – makeup director
 * Jeon Dal-lae at Lulu – makeup director
 * Won Jung-yo at Bit&Boot – makeup director
 * Choi Su-ji at Bit&Boot – makeup director
 * Oh Yu-ra – style director
 * Shin Hyun-kuk – management and marketing director
 * Kang Da-sol – choreographer
 * Kim Sun-mi – choreographer
 * Nana choreographer crew – choreographer
 * Today Art – printing
 * Moonshine – all instruments (on "Dance the Night Away")
 * Wheesung (Realslow) – vocal director (on "Dance the Night Away")
 * Kwon Seo-young – background vocals (on "Dance the Night Away")
 * Jung Eun-kyung – digital editor (on "Dance the Night Away")
 * Lee Woo-min "collapsedone" – all instruments, computer programming, guitar, and synths (on "Chillax" and "What Is Love?"), piano (on "What Is Love?")
 * Friday of Galactika – vocal director (on "Chillax"), vocal producer and background vocals (on "What Is Love?" and "Stuck"), recording engineer (on "Stuck")
 * E.Na – background vocals (on "Chillax", "What Is Love?" and "Stuck")
 * David Anthony Eames – all instruments and computer programming (on "Shot Thru the Heart")
 * Kevin Oppa – vocal director (on "Shot Thru the Heart")
 * Park Sung-mi – background vocals (on "Shot Thru the Heart")
 * Park Soo-min – background vocals (on "What Is Love?", "Sweet Talker" and "Ho!")
 * Erik Lidbom – all instruments, computer programming, and digital editor (on "Sweet Talker")
 * Armadillo – vocal director (on "Sweet Talker")
 * Jiyoung Shin NYC – additional editor (on "Sweet Talker", "Ho!", and "Dejavu")
 * The Elev3n – all instruments, computer programming, and digital editor (on "Ho!")
 * Kim Seung-soo – vocal director (on "Ho!")
 * Mental Audio (Eirik Johansen and Jan Hallvard Larsen) – all instruments and computer programming (on "Dejavu")
 * Hayley Aitken – background vocals (on "Dejavu")
 * Anne Judith Wik – background vocals (on "Dejavu")
 * Jowul – vocal director (on "Dejavu")
 * Lee Ju-hyeong – recording engineer, and vocal director, keyboard, Pro Tools operator, and digital editor (on "Say Yes")
 * Jeon Jae-hee – background vocals (on "Say Yes")
 * Jeok Jae – guitar (on "Say Yes")
 * Kim Byeong-seok – bass (on "Say Yes")
 * Frants – all instruments, computer programming, synth, bass, and drum (on "Stuck")
 * Shane – guitar (on "Stuck")

Locations
Recording
 * JYPE Studios, Seoul, South Korea

Mixing
 * Mirrorball Studios, North Hollywood, California
 * JYPE Studios, Seoul, South Korea
 * Koko Sound, Seoul, South Korea
 * 821 Sound, Seoul, South Korea

Mastering
 * 821 Sound Mastering, Seoul, South Korea