10 Must-Hear K-Pop B-Sides From December 2025

December 2025 was packed with major K-pop releases, but amid the holiday rush, a wealth of outstanding B-sides and under-the-radar tracks slipped past many listeners. From veteran soloists to rising groups, the final month of the year delivered some of the most rewarding deep cuts in recent memory. Here are ten tracks that deserve a spot on your playlist.

1. DOYOUNG (NCT) feat. Belle (KISS OF LIFE) — "Whistle"

Before enlisting in the military in December 2025, NCT's main vocalist Doyoung left fans with a parting gift. Following the success of his second solo album Soar, which solidified his reputation as one of K-pop's premier vocalists, "Whistle" showcased his refined tone alongside KISS OF LIFE's Belle, creating a breezy duet that balances warmth and sophistication. The collaboration was first revealed exclusively by Sports Chosun and quickly became one of the most talked-about year-end releases.

2. DAESUNG (BIGBANG) — "One Rose"

BIGBANG's powerhouse vocalist Daesung continued his triumphant solo comeback with "One Rose," a standout B-side from his debut mini album. Fresh off a sold-out Asia tour that culminated in a memorable encore concert at Osaka's Asue Arena in early February, Daesung channeled his signature emotional depth into a ballad that reminds listeners why his voice remains one of K-pop's most treasured instruments. During the Osaka shows, he opened with his title track "Universe" before delivering a set that spanned genres from R&B to pop rock.

3. MINHO (SHINee) — "You're Right"

SHINee's Minho delivered "You're Right" as part of his December solo single TEMPO, marking his return to solo releases a year after his first full-length album CALL BACK. The track highlights Minho's growth as a vocalist, leaning into a smooth, mid-tempo groove that suits his maturing artistry. As part of SM Entertainment's packed 2025 solo lineup, Minho proved he could hold his own alongside labelmates' releases.

4. THE BOYZ — "The Season"

"The Season" captures THE BOYZ at their most reflective, offering a warm, melodic contrast to the group's typically high-energy choreography tracks. With its lush harmonies and nostalgic production, the B-side proved that the eleven-member group's vocal capabilities are just as compelling as their explosive performances.

5. KANG DANIEL — "UPLIFT"

Former Wanna One center Kang Daniel closed out 2025 with "UPLIFT," a motivational anthem that channels his signature blend of pop sensibility and personal sincerity. The track's uplifting message and dynamic arrangement made it an underappreciated highlight of the month, showcasing the artist's continued evolution beyond his idol roots.

6. SAY MY NAME — "Bad Idea"

Rising group SAY MY NAME delivered one of December's most cohesive mini albums, with "Bad Idea" standing out as its boldest moment. The track's edgy production and confident delivery signaled a group on the verge of a breakthrough, earning particular praise from music curators for its exceptional replay value and tight vocal arrangements.

7. fromis_9 — "White Memories"

fromis_9 embraced the holiday spirit with "White Memories," a seasonal release that paired wintry synths with the group's characteristically bright vocals. While Christmas-themed tracks often fade from playlists once the season passes, the song's genuine charm and warm production give it staying power well into the new year.

8. SORN & MINNIE — "Reservations"

In one of December's most unexpected collaborations, former CLC member Sorn teamed up with (G)I-DLE's Minnie for "Reservations." The two Thai-born artists brought playful chemistry to the track, blending their contrasting vocal textures into something refreshingly unique within the K-pop landscape. The cross-group collaboration highlighted the growing trend of idol artists connecting across agency lines.

9. SECRET NUMBER — "Bitter Sweet"

The multinational girl group SECRET NUMBER explored emotional duality with "Bitter Sweet," a track that balances melancholic verses with an anthemic chorus. The song showcased the group's evolving musical identity and their ability to deliver emotionally resonant pop that transcends language barriers.

10. Rolling Quartz — "Masquerade"

K-pop's premier all-female rock band Rolling Quartz closed the year with "Masquerade," a guitar-driven track that channels theatrical energy. In an industry dominated by electronic production, the band continues to carve out a distinctive space with their live-instrument approach and powerful vocal performances.

Honorable Mentions

December's B-side bounty also included VERIVERY's groove-heavy "Blame Us," BTOB's Seo Eunkwang channeling dark charisma on "Monster," and ZE:A's Yim Siwan delivering the tender "Two Of Us" alongside his acting career. JUNIEL's cozy "Let It Snow" featuring Ko Youngbae and Weeekly member LUNEDI's introspective solo "FACE MYSELF" rounded out a month filled with hidden treasures waiting to be discovered.

As the K-pop industry barrels forward into 2026, these December gems serve as proof that some of the most rewarding music often lives beyond the title tracks and trending charts. For fans willing to dig deeper, the rewards are always there.