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| Start Date | Apr 15, 2021 |
| Host Nation | 🇰🇷 |
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On the afternoon of the 4th, the '2026 F/W Seoul Fashion Week' was held at Dongdaemun Design Plaza in Seoul, featuring LIGHTSUM members Ju-hyun and Cho-won on the runway. Additionally, LIGHTSUM formed their first unit, fulfilling a dream from their trainee days. The event also highlighted the Grammy-winning cover by a Korean artist, gaining renewed attention.
On the afternoon of the 4th, Seoul Fashion Week kicked off at the Dongdaemun Design Plaza, featuring the PHENOMENON SEEPER collection. Notable attendees included Han Seungwoo, DREAMCATCHER's Sua, and members from LIGHTSUM, Queenz Eye, and more. Additionally, Han Sona reportedly opposed her brother's idol debut, referencing their past matching outfits. The event also celebrated DREAMCATCHER's first unit, UAU, with a showcase for their mini-album 'Playlist #You Are You.'
At the 68th Grammy Awards, the song "Golden" from the Netflix film "KPOP Girls! Demon Hunters" won Best Song Written For Visual Media. The song, performed by the fictional girl group Huntr/x, achieved significant success, topping charts and garnering over a billion views on YouTube. It has inspired numerous K-POP artists to create cover versions, showcasing its global impact.
On January 21, MBC MUSIC's SHOW CHAMPION aired live from Goyang City, featuring ALPHA DRIVE ONE as the winner. Other performers included SAY MY NAME, Chuu, and members from Golden Child, n.SSign, LIGHTSUM, and former SM trainees. SAY MY NAME celebrated their first music show win after debuting on Music Bank.
On January 21, ALPHA DRIVE ONE achieved first place on MBC MUSIC's SHOW CHAMPION, just 10 days post-debut. The show featured performances from various artists including SAY MY NAME, Chuu, and former SM trainees. The event took place at MBC Dream Center in Gyeonggi-do, highlighting the rapid rise of ALPHA DRIVE ONE in the music scene.
LIGHTSUM's first unit, featuring San-a, Chowon, and Juhyun, has launched their digital single "Beautiful Pain," showcasing their distinct vocal styles. The song reinterprets BTOB's hit, blending acoustic elements with emotional depth. The members express excitement and gratitude towards their fans, SUMIT, for their support.
LIGHTSUM announces the release of their first unit single 'Beautiful Yet Sad' by members Sunah, Chowon, and Juhyun. The song features emotional vocals and a reinterpretation of a BTOB hit, blending acoustic guitar melodies with LIGHTSUM's delicate sensibilities. The trio aims to deliver warmth during winter, and their previous cover of 'Golden' has already garnered significant attention. The single is available on all music streaming platforms.
CUBE Entertainment announced that LIGHTSUM will debut a new unit group consisting of Sanah, Chowon, and Juhyun, releasing a single in January. The trio, dressed in white against a black background, exudes sophistication and harmony. They previously gained attention with their cover of 'Golden' for the Netflix OST of 'KPOP Girls! Demon Hunters.'
On the afternoon of the 5th, the 2026 S/S Seoul Fashion Week kicked off at the Dongdaemun Design Plaza, featuring a photo wall event for the 'Kwak Hyun-joo' collection. Attendees included K-pop idols from Billlie, former NMIXX member Jinny, and various other stars, showcasing the event's star power.
The tweet translates to: "I thought Lightsum would be the first to rise, but they were ignored, huh? LOL. TOP 4 K-Pop groups that are inferior to senior groups #kpop #babymonster #itzy #kiikii #hearts2hearts youtube.com/shorts/rjA4heb…"

Recently, I've been watching a lot of videos on YouTube Shorts of a K-pop girl named Chowon from Lightsum shaking her chest.

The tweet translates to: "#FieldRecording LIGHTSUM/Honey or Spice NADAC is gradually getting used to it and has started to produce low frequencies."

Good morning ☁️ Today's MUFU🥰 Selection is "Beautiful Pain" by LIGHTSUM 🎶 It's a soothing song ☺️ I'll do my best at work today as well. youtu.be/PfA6kxU3QGc?si…

The tweet translates to: "LIGHTSUM Na-Young, Nayeon-chan 🤤 pic.x.com/kBwkHpo19k" (Note: "Nayeon-chan" is a term of endearment, with "chan" being a suffix used in Japanese to express affection.)

The translation of the tweet is: "Announcement of the LIGHTSUM popular member ranking!"

The tweet translates to: "The miracle of small and medium-sized companies, I personally want it to explode even more right now. Toes, Promi, Licenne, Stacey, Eunice, Billy. Actually, I wanted to include Light Sum too."

The translation of the tweet is: "I want to have this style, sob sob. It's LIGHTSUM's Juhyun-chan!"

"It's been two months since I created my personal account for Lightsum, but it's sad that my followers aren't increasing because Cube is so incompetent. It's just plain lacking in taste that everyone isn't following Juhyun."

The tweet translates to: "[📺] I think I'll remember a lot about Beautiful Pain's activities before going to bed │ 'Beautiful Pain (SANGAH, CHOWON, JUHYEON)' activity behind the scenes │ LIGHTSUM SUMDAY #65 🔗 youtu.be/v-eRd6qqOHw #LIGHTSUM #라잇썸 #ライトサム #SUMDAY #썸데이 x.com/CUBE_LIGHTSUM/…"

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