[ASTROCHILD IN THE LONELY PLANET] Kei (케이) – Smile

[ASTROCHILD IN THE LONELY PLANET] Kei – Smile" is an OST single released on December 26, 2025 under Kakao Entertainment. Performed by Kei (케이), the track “Smile” is part of the soundtrack for the animation/webtoon project ASTROCHILD IN THE LONELY PLANET. Kei, known for her clear vocals and emotional delivery, brings warmth and depth to the song, enhancing the narrative of the project. The release includes an official music video on YouTube and highlights Kei’s versatility as an artist beyond her established career in K-pop.