Blue (Yung Kai song)

"Blue" was inspired by the 2023 Chinese television series When I Fly Towards You. Yung Kai was binge-watching it on Discord with a girl he liked at the time and from the whole moment, he "put[s] up all of the built-up emotions he had together into the song."^[7] The song, estimated by Yung Kai himself, was completed within two weeks before being released.^[8]

"Blue" was solely produced and written by Yung Kai himself.^[9] The song was composed in the key of E major, with a tempo of 97 beats per minute.^[10]

According to an interview with Genius, the first verse is about love at first sight. The chorus part, which invented the title "Blue" although not explicitly mentioned in the song, came from his interpretations of several elements that "sounds like blue" such as waves and ocean he mentioned "I'll nap under moonlight skies with you / I think I'll picture us, you with the waves / The ocean's colors on your face". Originally, the supposed chorus of the song was the current second verse, before he changed it since his friend who had initially heard the song '[wasn't] really feeling it'.^[11]

The music video for "Blue" was released on December 12, 2024. Directed by Kenji K Chong, the music video shows Yung Kai, alongside his love interest (portrayed by Julia Ma) who represent the song's lyrics, living an ordinary cute love story; it was revealed at the end to be his imagination as the camera zooms out to Kai –now alone – staring out towards the open ocean.^[12] The twist at the end of the music video was proposed by Yung Kai himself, who also contributed on the planning and storyboarding.^[8]

Yung Kai performed the song on various festival in Asia, such as Pelupo Festival in Thailand,^[13] and Wanderland Music and Arts Festival in the Philippines.^[14] On March 17, 2025, he put on a performance of the song on Indonesian Idol Season 13.^[15]