NMIXX has officially begun their comeback activities through a countdown live event celebrating the release of their first full-length album. On the 13th at 6 p.m., NMIXX released their first full album, "Blue Valentine," along with the title track of the same name. The title track "Blue Valentine" conveys the message of igniting a cold heart at the point where emotions clash. The song captivates listeners with a harmonious blend of melancholic synth sounds, guitar riffs, and boom bap rhythms.

Fans responded positively to the album, saying, "The music, concept, and music video are all top-tier," "It's an album that's good to listen to anytime, day or night," "This is the first full album that shows a more grown-up NMIXX," "I'm happy there are more songs to listen to," and "The title track fits the chilly weather with a bittersweet yet overwhelming feeling."

As of midnight on the 14th, the title track "Blue Valentine" ranked 11th on Melon Top 100, 1st on Hot 100 (100 days), and 1st on Hot 100 (30 days). It also took the top spot on the Bugs real-time chart. The new release topped the Hanteo Chart album chart at 10 p.m. on the 13th and continued its popularity by ranking 1st on the Korean Apple Music Top Albums chart and on iTunes Top Albums charts in overseas markets such as Hong Kong, Kazakhstan, and Singapore as of 8 a.m. on the 14th.

LILY, Haewon, SeolYoon, BAE, Jiwoo, and Kyujin held a countdown live on NMIXX's official YouTube channel at 4:40 p.m. on the 13th, communicating with fans. They greeted fans by saying, "We are very excited to head toward a new stage with ENSWER," and "Since this is our first full album, we put a lot of time and effort into preparing it, and we hope many people will like it." Their real-time interaction with fans heightened anticipation for the comeback.

The album description highlights a concept visualizing the "ambivalence of love," introducing key points for appreciating all 12 tracks and showing confidence in the masterpiece. The title track "Blue Valentine" blends well with the cool autumn atmosphere. The album includes various songs such as "SPINNIN' ON IT," which was pre-released as a music video, "Phoenix," which carries a powerful message of rising like a phoenix, "Reality Hurts," the first English lyric song co-written by LILY, "RICO," a mix of Latin pop and hip-hop, and "PODIUM" and "Crush On You," which Haewon helped write to add emotional depth.

Notably, LILY and Haewon, who are credited as lyricists on the new album, shared their creative process, enhancing the album's completeness. Additionally, the six members produced content depicting the NMIXX universe as a webtoon as part of their comeback promotion, provided voice acting like an audiobook, and hosted a telepathy music wave game, offering fans new entertainment.

At the end of the live, NMIXX said, "The countdown live ends here, but the activities for NMIXX's first full album are just beginning, so we will work hard moving forward. Please give lots of love to NMIXX's new album and the title track 'Blue Valentine,' and let's make joyful memories together with NMIXX." They expressed their determination for future activities.

Through their first full album "Blue Valentine," NMIXX has laid the foundation for a leap forward in the second half of 2025. They plan to hold their first solo concert under the name NMIXX on November 29 and 30. Through this, they aim to further solidify their presence as the "Hexagonal Girl Group."