One Fine Day is the debut solo studio album by South Korean musician Jung Yong-hwa of CNBLUE. It was released on January 20, 2015, by FNC Entertainment and distributed by CJ E&M. As CNBLUE's promotions for their mini-album Can't Stop (2014) came to a close, the label announced plans for Jung to release a solo album within the year. Since the album's inception, he sought to distance himself from the band's sound and include various musical styles on the record. Ultimately, he conceived a collaborative album with an array of musicians.

Jung Yong-hwa, also known mononymously as Yonghwa, is a South Korean singer, musician and actor. He is the leader, lead vocalist and rhythm guitarist of the rock band CNBLUE. Jung made his television debut in You're Beautiful (2009), and has since starred in television dramas Heartstrings (2011), Marry Him If You Dare (2013), The Three Musketeers (2014), The Package (2017) and Sell Your Haunted House (2021). On the music front, Jung also made his solo debut with the album One Fine Day in 2015.