NCT's Doyoung surprised fans with a live performance video of "Whistle," a B-side track from his new single "Promise," featuring Belle of KISS OF LIFE. The video was released on December 12, 2025, showcasing the smooth harmonies and captivating chemistry between Doyoung and Belle.
Doyoung's agency, SM Entertainment, had announced the release of "Promise" on December 7, 2025, revealing that the single would be available on various music platforms on December 9, 2025, at 6 PM. The single includes the title track "Promise" and the B-side "Whistle (Feat. BELLE of KISS OF LIFE)".
"Whistle" is described as an R&B ballad that captures the enchanting moment of exchanging feelings through whistling. The song blends sweet vocals with a jazz guitar melody, creating a fluttery and adorable atmosphere. Belle's feature on the track adds another layer of vocal harmony, complementing Doyoung's voice.
The live performance video gives fans a special glimpse into the collaboration, highlighting the vocal synergy between Doyoung and Belle. The performance emphasizes the delicate emotions conveyed in "Whistle", offering a different experience from the recorded version. The video quickly garnered attention from fans, generating excitement and positive feedback on social media platforms.
Doyoung's "Promise" marks a significant moment in his solo endeavors, displaying his vocal skills and artistic expression. The collaboration with Belle adds a layer of intrigue, combining the fan bases of NCT and KISS OF LIFE. This collaboration has not only pleased fans but also highlighted Doyoung's willingness to explore different musical styles and collaborate with emerging artists.
The release of "Promise" and the live performance of "Whistle" demonstrate Doyoung's ongoing commitment to connecting with his fans and delivering high-quality music. As Doyoung continues his solo journey, fans can anticipate more exciting projects and collaborations that highlight his talent and versatility. The live performance video is available on NCT's official YouTube channel.
