HYDRA (하이드라) is the third studio album by SolSys. It was released on May 13, 2025, with "Girls Never Die" serving as the album's title track.
The album marks the formal debut of members Yeom Sojin, Eri, Yu Min, Demi, Choi Yara, Um Seoeun, Nam Heeryeong, Natalie, Hyun Sookyung, Oh Jimin, Masami, Kwan Jieun, Sunwoo, Jang Geonhee, and Takako.
The album comes in two versions: Constellation and Monster.
Background[]
During the SolSys World tour, the group performed "Our Dimension", a song that was confirmed to be on the group's upcoming release.
Sometime in 2025, it was reported that SolSys was preparing for their first comeback since ORION. On April 12, 2025, the group announced that they will be releasing their third studio album HYDRA on May 13. Simultaneously, the title track was revealed to be "Girls Never Die".
Composition[]
"Our Dimension" is a new jack swing song that describes the feeling of being united. It also describes how their fans and SolSys will never leave each other's sides.
"Girls Never Die" is a pop song symbolizing the need to push forward during the hardest times of life; in the song, depression. Many critics have said that the song is very meaningful to those who have depression and see the song as a way to "...remember that [you] matter."
Tracklist[]
| No. | Title | Unit | Writer(s) | Composer(s) | Arranger(s) | Song Ref. |
|---|---|---|---|---|---|---|
| 1 | "Into The SolSys" | Group | N/A | Umi | Umi, Seo Yoon-hee | "Light It Up" (ARTMS) |
| 2 | "Girls Never Die" | Group | Livvy Yang, Chae Dahee, Jeong Hayan, Vannie, DAN.B | Yuuri, JIUU, Hyun Sookyung, Demi, Takamura Sukima, DAN.B | Yuuri, Jeong Hayan, Lee Suyoung, T.Yul, Demi | "Girls Never Die" (tripleS) |
| 3 | "We Are!" | Group | Ju Sungjoon, Lumin, Lee Soo, Hyun Sookyung | Ronnie Jeong, Duvi, Demi, Son Izumi | Lee Soo, Demi, Son Izumi, Sehwan | "24" (tripleS) |
| 4 | "I Got Your Heart" | Group | Choi Yan Yeon, Sehwan, Byulju | Choi Yan Yeon, Jeong Hayan, Lee Dabin | Lee Dabin, Jeong Songkye, Sw!tch | "Heart Chaser" (tripleS) |
| 5 | "Our Dimension" | Group | Sehwan, Se Jun, Lee Soo, Demi | Zeke, Yeom Sojin, Hyun Sookyung, Demi, Takamura Sukima | Sehwan, Lee Soo, Lumin, Kyungbyeol | "Dimension" (tripleS) |
| 6 | "Into 9" | Jang Myungseo, Min Jaeji, Han Yooneul, Kang Eunhee, Kim Yehee, Seo Hanhee, Kim Semin, Kim Saewon, Gi Yunmi | DJ Jun | TWOONG | TWOONG | "Visionary Vision" (tripleS Visionary Vision) |
| 7 | "Soul" | Jang Myungseo, Min Jaeji, Han Yooneul, Kang Eunhee, Kim Yehee, Seo Hanhee, Kim Semin, Kim Saewon, Gi Yunmi | Jeon Jiyong, Takami, Demi, Yeom Sojin | Xeno, Tia, Yeom Sojin, Hyun Sookyung | Hyun Sookyung, ChaeJi, QuackTae, t.Yul | "Black Soul Dress" (tripleS LOVElution) |
| 8 | "Fever" | Jang Myungseo, Min Jaeji, Han Yooneul, Kang Eunhee, Kim Yehee, Seo Hanhee, Kim Semin, Kim Saewon, Gi Yunmi | DAN.B, Cheon Seungyeon, Yang Seungsul, Jeong Sujin, Lee Bin | nicolxtte, DAN.B, ChaeMi, Lee Sungjin | 2BIN, eSun, Demi, Hyun Sookyung | "미열 37.5" (tripleS EVOLution) |
| 9 | "How Are You So Colorful?" | Jang Myungseo, Min Jaeji, Han Yooneul, Kang Eunhee, Kim Yehee, Seo Hanhee, Kim Semin, Kim Saewon, Gi Yunmi | Luella Jeong, Demi, Lumin, Eiji | Hyun Sookyung, Demi, Cheon Suyeongji, Lee Bin | Hyun Sookyung, Yeom Sojin, Demi, MB.SJ | "Colorful" (tripleS) |
| 10 | "AY" | Jang Myungseo, Min Jaeji, Han Yooneul, Kang Eunhee, Kim Yehee, Seo Hanhee, Kim Semin, Kim Saewon, Gi Yunmi | Yang Hyeonjin, HShui, iXPO, PonyMan | Minjun, Lee Soo, Kai, Seungjong, Lee Chae Soon, Seung Jo | Seung Jo, Alexandra Mianis, HeeWon, Dou | "ROTY" (YOUNG POSSE) |
| 11 | "Into 18" | Guanyu, Chwe Heiyoung, Rika, Yeom Sojin, Eri, Yu Min, Demi, Choi Yara, Um Seoeun | Lee Cheon-jin | Jeong Ha-yan, t.Yul | Hyun Sookyung | "Access" (Acid Angel from Asia) |
| 12 | "Life Can Be Hard" | Guanyu, Chwe Heiyoung, Rika, Yeom Sojin, Eri, Yu Min, Demi, Choi Yara, Um Seoeun | Saerom, Nam Hyuksang, Lee Jongbin, Seo$ | Saerom, Yoon Daeun, Graciella, Jeong Songkye, Heejung | Sejol, Hyun Sookyung, Aurora Kim, U-WIN | "Heavy Metal Wings" (tripleS EVOLution) |
| 13 | "Joker" | Guanyu, Chwe Heiyoung, Rika, Yeom Sojin, Eri, Yu Min, Demi, Choi Yara, Um Seoeun | Molly, DAN.B, Lee Dabin, Jeong Hayan, Jeong Songkye | Molly, DAN.B, Quotation, LE3 | Molly, LE3, Alexandra Mianis, Soshin | "Mcguffins ~ who's the Joker?" (Billlie) |
| 14 | "Sign" | Guanyu, Chwe Heiyoung, Rika, Yeom Sojin, Eri, Yu Min, Demi, Choi Yara, Um Seoeun | Li Yichen, Hyun Sookyung, Demi, Yeom Sojin | Li Yichen, Yeom Sojin, Hyun Sookyung, Demi, Takamura Sukima | Sehwan, Lee Soo, Avaron, Min Gyu | "a sign ~ anonymous" (Billlie) |
| 15 | "Aired On TV" | Guanyu, Chwe Heiyoung, Rika, Yeom Sojin, Eri, Yu Min, Demi, Choi Yara, Um Seoeun | Elio, Suhwon, Lee Seongcheol, Juyung | Jeon Jaeyong, Suhwon, Yoon Juyul, Lee Soo | Jeon Jaeyong, Seo Yoon-hee, Yoon Juyul, Gong Songwon | "Truman Show" (Loossemble) |
| 16 | "Into 27" | Nam Heeryeong, Natalie, Hyun Sookyung, Oh Jimin, Masami, Kwan Jieun, Sunwoo, Jang Geonhee, Takako | Jue | Linni Jeong | Claire.Voyant | "Cherry 100%" (tripleS +(KR)ystal Eyes) |
| 17 | "Goback" | Nam Heeryeong, Natalie, Hyun Sookyung, Oh Jimin, Masami, Kwan Jieun, Sunwoo, Jang Geonhee, Takako | Claire.Voyant, Sungjoon, Byuk2, Demi | Feel, Hyun Sookyung, Demi, Yeom Sojin, Takamura Sukima | t.Yul, HOXI, Claire.Voyant, BREATHER | "B@ck to where we Belong" (Billlie) |
| 18 | "Lionheart" | Nam Heeryeong, Natalie, Hyun Sookyung, Oh Jimin, Masami, Kwan Jieun, Sunwoo, Jang Geonhee, Takako | Manwol, Jeong Hayan, Jeong Songkye, MIKA | MIKA, Jeong Hayan, Sokyung, Hyun Sookyung | Yeom Sojin, Youngjae, Suheun, Leebin | "lionheart (the real me)" (Billlie) |
| 19 | "Nights" | Nam Heeryeong, Natalie, Hyun Sookyung, Oh Jimin, Masami, Kwan Jieun, Sunwoo, Jang Geonhee, Takako | Yewon, BREATHER, MIKA, Jeong Hayan, Han Joo | Na Chaehyun, Yewon, Lee Seongcheol, Hong Juni | Na Chaehyun, Hong Juni, Lee Seongcheol, Han Joo | "enchanted night ~ white night" (Billlie) |
| 20 | "Stars (하늘을 밝게 비추다)" | Nam Heeryeong, Natalie, Hyun Sookyung, Oh Jimin, Masami, Kwan Jieun, Sunwoo, Jang Geonhee, Takako | Leeni, WWON, Jeong Seong, O1LY | JIUU, Jeong Songkye, Jeong Hayan, t.Yul | t.Yul, Hyun Sookyung, Demi, Kyungbyeol, Seo Yoon-hee | "Starlight" (Loossemble) |
Promotions[]
The album was released on the aforementioned date.
Album packaging[]
The album comes in 2 versions: Constellation and Monster. The album consists of:
- Lyric pages
- Photobook
- Behind-the-scenes pages
- Thanks-to pages
- Photocards
- Polaroids
- Posters
- CD
- Cassette
- Vinyl
- ID photos
- Constellation keychain (if buying constellation version)
- Monster keychain (if buying monster version)
- Member keychains
- Group keychains
- Scannable photocards
- Tracklist pages
- Snap band
Constellations[]
In accordance with their solar system concept, all members represent one of the 88 modern constellations.
| Member | Constellation |
|---|---|
| Jang Myungseo | Andromeda |
| Min Jaeji | Ursa Major |
| Han Yooneul | Virgo |
| Kang Eunhee | Corona Borealis |
| Kim Yehee | Cassiopeia |
| Seo Hanhee | Perseus |
| Kim Semin | Fornax |
| Kim Saewon | Mensa |
| Gi Yunmi | Lupus |
| Guanyu | Pegasus |
| Chwe Heiyoung | Tucana |
| Rika | Octans |
| Yeom Sojin | Equuleus |
| Eri | Vulpecula |
| Yu Min | Pyxis |
| Demi | Horologium |
| Choi Yara | Leo Minor |
| Um Seoeun | Sagitta |
| Nam Heeryeong | Ophiuchus |
| Natalie | Apus |
| Hyun Sookyung | Monoceros |
| Oh Jimin | Pisces |
| Masami | Cancer |
| Kwan Jieun | Triangulum |
| Sunwoo | Phoenix |
| Jang Geonhee | Norma |
| Takako | Coma Berenices |
TikTok Challenges[]
| Date | Translated Caption | Member(s) Featured | Idol(s) Featured | Audio |
|---|---|---|---|---|
| May 14, 2025 | "SNOWBABY Never Dies! ❄️💖 #snowbaby #interstellar" | Chwe Heiyoung | Snowbaby (INTERSTELLAR) | "Girls Never Die - SolSys" |
| May 15, 2025 | "JENERATION Never Dies! ⚙️🎶#samika #jeneration" | Kim Saewon | Samika (JΣПΣЯΛƬIӨП) | "Girls Never Die - SolSys" |
| May 15, 2025 | "yztruly, solsys x 💖 #aki #yztruly" | Guanyu | Aki (YZTRULY) | "Girls Never Die - SolSys" |
| May 15, 2025 | "LUNAX never dies! Woah, they're all here... #lunax" | Demi, Natalie, Takako | LUNAX | "Girls Never Die - SolSys" |
| May 16, 2025 | "an AURORA borealis never dies!🌟✨ #aurora" | Min Jaeji, Gi Yunmi. Yu Min | AURORA | "Girls Never Die - SolSys" |
| May 16, 2025 | "RITA never dies! 💖🖤 #rita" | Yeom Sojin | Rita | "Girls Never Die - SolSys" |
| May 17, 2025 | "J.MIN just can't die! 🕺🎶 #jmin" | Sunwoo | J.Min | "Girls Never Die - SolSys" |
| May 17, 2025 | "NEON AXYS??? Oh my god, I think I might die! 😵💫🎵 #neonaxys" | Jang Myungseo, Rika, Choi Yara, Um Seoeun, Oh Jimin | Neon Axys | "Girls Never Die - SolSys" |
| May 17, 2025 | "This khaos just can't die, what do we do? #khaos #taran #dae" | Hyun Sookyung, Kwan Jieun | Taran, Dae (khaos) | "Girls Never Die - SolSys" |
| May 18, 2025 | "SERAINity with JEEUN and ILYA! 🌟💖#serain #jeeun #ilya" | Han Yooneul, Kim Yehee | Jeeun, Ilya (SERAIN) | "Girls Never Die - SolSys" |
| May 18, 2025 | "The 5thSeason remains ETERNAL! 🌸🍂 #5thseason" | Kang Eunhee, Seo Hanhee, Kim Semin, Masami, Kwan Jieun | 5thSeason | "Girls Never Die - SolSys" |
| May 18, 2025 | "ODYSSEIA never dies!! 💫❤️ #odysseia #moyeon #livvy #tessie" | Yu Min, Choi Yara, Jang Geonhee | Shin Moyeon, Livvy Yang, Tessie Chu (ODYSSEIA) | "Girls Never Die - SolSys" |
| May 19, 2025 | "UEHARA RUNA never dies! #uehararuna" | Nam Heeryeong | Uehara Runa | "Girls Never Die - SolSys" |
Gallery[]
Group
(Jang Myungseo, Min Jaeji, Han Yooneul, Kang Eunhee, Kim Yehee, Seo Hanhee, Kim Semin, Kim Saewon, Gi Yunmi)
(Jang Myungseo, Min Jaeji, Han Yooneul, Kang Eunhee, Kim Yehee, Seo Hanhee, Kim Semin, Kim Saewon, Gi Yunmi)
Group
(Nam Heeryeong, Natalie, Hyun Sookyung, Oh Jimin, Masami, Kwan Jieun, Sunwoo, Jang Geonhee, Takako)
(Nam Heeryeong, Natalie, Hyun Sookyung, Oh Jimin, Masami, Kwan Jieun, Sunwoo, Jang Geonhee, Takako)
Tracklist
[]
| SolSys | ||
|---|---|---|
| Members | ||
| Takako • Sunwoo • HeiYoung • SoJin • YoonEul • HanHee • JaeJi • YunMi • EunHee • JiMin • SeoEun • HeeRyeong • SooKyung • SaeWon • YeHee • JiEun • Katarina • Natalie • Guanyu • MyungSeo • SeMin • YaRa • Rika • Demi • Min • NaYoung • Eri • Masami • IlJin • TaeYul • YoRin | ||
| Discography & Concerts | ||
| Korean | Studio albums | BACK2BACK <Passe> • NEMESiS <Benevolence> |
| Mini albums | dalkomdalkom <AWESOME> • ORION • REC0VER <ANTIQUE> • NOV(US) <NOVUS> • Puriti.G <Wholesome> • VARIOUSLESS <Tempo> • Eclantant(e) <Ornate> • 5SION <Rush> | |
| Single albums | "TBA" | |
| Digital singles | "REC0VER <Inhyeong (Doll-like)>" | |
| Concerts | World Tours | SolSys World |
| Sub-units | ||
| dalkomdalkom • REC0VER • Puriti.G • VARIOUSLESS • NOV(US) • Eclantant(e) • BACK2BACK • NEMESiS • 5SION | ||
| Related topics | ||
| SYSHOME • SOLRISE! | ||