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Omega X's Yechan, CLASS:y's Hyungseo release 'Up and Down'

Entertainment | Hallyuwood

Omega X's Yechan, CLASS:y's Hyungseo release 'Up and Down'

By Jonathan Hicap

Omega X's Yechan and CLASS:y's Hyungseo (IPQ)

Omega X's Yechan and CLASS:y's Hyungseo (IPQ)

Yechan, the youngest member of K-pop boy band Omega X and its sub-unit OX:N, teamed up with Hyungseo of K-pop girl group CLASS:y and released a new duet single, “들었다놨다 (Up and Down).”

The project was produced by CIELOGROOVE,a team of producers and songwriters that is known for collaborating with Korean artists such as Kim Jaejoong, WEi, and BAE173, as well as for their work with survival programs like “Peak Time” on JTBC and “Scool” on SBS M/SBS FiL.

“It feels quite nervous to release my first duet track with a female artist! For this project, I tried my best to highlight a softer voice than the energetic one which I’m more used to, and I’m glad to hear that my voice carried the emotions of the song well,” said Yechan.

The song features acoustic guitar rhythms and a smooth melody, expressing the excitement of falling in love and playing hard to get. It elevated its romantic vibe with Yechan and Hyunseo’s soft yet refreshing vocal collaboration.

It is the second duet project from CIELOGROOVE in 2025, followed by “좋아한다 말할래 (I wanna say I love you),” featuring Song Sun of TRI.BE and GK, which was released in April.

The new duet project also comes shortly after Yechan debuted as a member of OX:N, the first sub-unit of Omega X, last June 20th.

The four members of OX:N will hold their first fan meeting titled “INTO:N” in Tokyo on Sept. 10 and 11 after connecting with fans in Korea, Shanghai, and Macao.

Omega X's Yechan and CLASS:y's Hyungseo (IPQ)

Omega X's Yechan and CLASS:y's Hyungseo (IPQ)

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