"A Brand New Day" is a song by J-Hope and V of South Korean boy band BTS and Swedish singer Zara Larsson, released on June 14, 2019, as the second single from the '. It was produced by Mura Masa.
"A Brand New Day" has been described as an "electronic hip-hop song", with instrumentation featuring a prominent daegeum, a Korean bamboo flute, and producer Mura Masa providing an accompanying beat.