DOYOUNG of NCT expressed his gratitude and heartfelt love for fans through his new single 'Promise,' which was released worldwide on various music streaming platforms at 16:00 Thailand time on 9 Dec 2025. The music video for the title track '늦은 말 (Promise)' is also available simultaneously on SMTOWN's YouTube channel.
This single includes two songs: the title track '늦은 말 (Promise)' and 'Whistle (Feat. BELLE of KISS OF LIFE).' Both songs convey DOYOUNG's deep appreciation to fans who have consistently shown steadfast love, inviting listeners to experience a warm and touching sentiment.
The title track '늦은 말 (Promise)' is a ballad that begins with a simple keyboard melody, gradually deepening the emotion with added strings in the latter half. The lyrics, written by DOYOUNG, express heartfelt confessions of gratitude and love—acknowledging that the deeper the love grows, the harder it is to express. Though the words come late, they resonate profoundly beyond ordinary feelings.
The music video for '늦은 말 (Promise)' symbolically portrays gratitude and apology through a clover pot, representing the bond between DOYOUNG and his fans. Scenes showing the changing seasons convey a message of remembrance despite temporary separation, making it a meaningful gift for his fans.
Additionally, the other song on the single, 'Whistle (Feat. BELLE of KISS OF LIFE),' is an R&B ballad that depicts moments of exchanging feelings through whistling. The vocals of DOYOUNG and BELLE blend like a conversation set against jazz guitar melodies, creating an endearing and heartwarming feeling.
