Sunmi, a former member of Wonder Girls, ventured into a successful solo career in 2013 with hits like "24 Hours" and "Siren," and EPs such as Full Moon and Warning. Originally from Iksan, North Jeolla, Sunmi studied musical theater and joined Wonder Girls in 2006, contributing to their debut album The Wonder Years with hits like "Tell Me," "So Hot," and "Nobody." After a brief hiatus to focus on academics, Sunmi returned as a solo artist in 2013, releasing chart-topping singles and albums that blend urban synth pop and EDM, including the EP Full Moon and her second EP, Warning, featuring the hit "Siren."

In 2010, Sunmi left Wonder Girls to pursue academic endeavors before returning to music in early 2013 as a solo artist. She achieved chart success with singles like "24 Hours" and rejoined Wonder Girls for their final album, Reboot. Sunmi then signed with Makeus Entertainment in 2017, releasing hits like "Gashina" and "Heroine" before dropping her second EP, Warning, in September 2018, which included the popular track "Siren." She embarked on her first world tour in February 2019, introducing singles like "Noir" and "Laylaylay" to her growing fan base.