Merry & Happy
Merry & Happy is the reissue of South Korean girl group Twice's first studio album, Twicetagram. The Christmas-inspired album was released on December 11, 2017. In addition to the original track listing, it has two new songs: the first track is titled "Heart Shaker" and the eponymous second track "Merry & Happy" was written by Park Jin-young. The album and "Heart Shaker" debuted at No. 1 on four charts of Gaon—Album Chart and Digital Chart, Download Chart and Social Chart respectively, while "Merry & Happy" entered and peaked at No. 24 on Digital Chart.
Twice performed both "Heart Shaker" and "Merry & Happy" on music programs—Music Bank, Show! Music Core and Inkigayo on December 15–17, respectively. The music video of "Merry & Happy" was set for release on December 21, but was delayed until the next day out of respect for Shinee's Jonghyun, whose burial service was held on December 21.
Content production
Credits adapted from album liner notes.Locations
; Recording- JYPE Studios, Seoul, South Korea
- Studio Instinct, Seoul, South Korea
- E.one Sound, Seoul, South Korea
- Heavymental Studios, Seoul, South Korea
- NUPLAY Studio, Seoul, South Korea
- Studio567, Seoul, South Korea
- Banzak Studio, Seoul, South Korea
- Mirrorball Studios, North Hollywood, California
- JYPE Studios, Seoul, South Korea
- Studio Sean, Seoul, South Korea
- Cube Studio, Seoul, South Korea
- Honey Butter Studio, Seoul, South Korea
- Sterling Sound, New York City, New York
- 821 Sound Mastering, Seoul, South Korea
Personnel
- J. Y. Park "The Asiansoul" – producer
- Lee Ji-young – direction and coordination
- Jang Ha-na – music
- Kim Yeo-joo – music
- Park Sun-hyeong – music
- Kim Ji-hyeong – production
- Choi A-ra – production
- Kim Je-na – production
- Gong Da-yoon – production
- Kim Bo-hyeon – design
- Kim Tae-eun – design, web design, album art direction
- Choi Hye-jin – recording, mixing and assistant mixing engineer
- Eom Se-hee – recording and assistant mixing engineer
- Jang Han-soo – recording and assistant mixing engineer
- Friday of Galactika – recording engineer and chorus
- Jowul – recording engineer, vocal producer, vocal director and background vocals
- Jeong Ho-hyun – recording engineer, all instruments and keyboard
- Earattack – recording engineer, and all instruments and computer programming
- * bass, background vocals and director
- Jeong Gyu-chang – recording engineer
- Kevin Oppa – recording engineer, vocals producer, computer programming, piano and digital editing
- Frants – recording engineer, all instruments and computer programming
- Tony Maserati – mixing engineer
- James Krausse – mixing engineer
- Lee Tae-seob – mixing engineer
- Lim Hong-jin – mixing and assistant mixing engineer
- Staytuned – mixing engineer
- Yoon Won-kwon – mixing engineer
- Jossi Ahjussi – mixing engineer
- Jeon Bu-yeon – assistant mixing engineer
- Bae So-yoon – assistant mixing engineer
- Park Jeong-eon – mastering engineer
- Chris Gehringer – mastering engineer
- Kwon Nam-woo – mastering engineer
- Naive Production – video director
- Kim Young-jo – video executive producer
- Yoo Seung-woo – video executive producer
- Choi Pyeong-gang – video co-producer
- Kim Young-joon at Agency SEED – photographer
- Kang Hye-in at Normallogic – album design
- Kang Hye-in at Normallogic – album design
- Choi Hee-seon at F. Choi – style director
- Son Eun-hee at Lulu – hair and makeup director
- Jung Nan-young at Lulu – hair and makeup director
- Choi Ji-young at Lulu – hair and makeup director
- Jo Sang-ki at Lulu – hair and makeup director
- Zia at Lulu – hair and makeup director
- Jeon Dal-lae at Lulu – hair and makeup director
- Won Jung-yo – makeup director
- Yoon Hee-so – choreographer
- Kang Da-sol – choreographer
- Today Art – printing
- David Amber – all instruments, computer programming
- Avenue 52 – all instruments, additional programming
- Galactika – vocal director
- e.Na – chorus
- Joe Lawrence – all instruments, computer programming
- Jihyo of Twice – background vocals
- Nayeon of Twice – background vocals
- Kim Cho-young – background vocals
- Rado – all instruments, computer programming and background vocals
- Choi Hoon – bass
- Yoon Tae-woong – guitar
- Kim Yoon-ji – chorus
- Kim Jong-seong – guitar
- Nam Joo – background vocals
- Jeong Yoo-ra at Cassette08 – digital editing
- Jeong Dong-hwan & Park Ji-yong & Nusoul – keyboards
- Kriz – background vocals
- Park Gi-tae – guitar
- NAOtheLAIZA – all instruments and computer programming
- Antti Hynninen – all instruments and computer programming
- Caesar & Loui – all instruments and computer programming
- Oh Han-sol – background vocals
- Hyerim – background vocals
- Fox Stevenson – all instruments and computer programming
- Bin – background vocals
- Darren Smith – all instruments and computer programming
- Chris Wahle – all instruments and computer programming
- Kim So-ri – chorus
- Kim Jun-soo – guitar
- Lee Da-jeong – background vocals
Charts
Year-end charts
| Chart | Position |
| South Korean Albums | 77 |