IU released the digital single Unknown Planet on September 10, 2026, a double A-side led by "Dear my crazy soulmate." The song is a relaxed, feel-good mid-tempo pop track with a simple looping melody over a gentle instrumental. IU wrote the Korean lyrics and dedicated it to her longtime friend, the actress Yoo In Na, about fully accepting a close friend. The single's co-title, "Unknown Planet," is a collaboration with Cloud koh and SUMIN. It is her first release in about a year.
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IU, whose given name is Lee Ji-eun, is a South Korean singer-songwriter and actress who debuted in 2008. One of the most successful and acclaimed soloists in K-pop history, she is known for writing much of her own music and for a catalog that spans bright pop, ballads, and folk-tinged singer-songwriter material. Her 2010 single "Good Day" became a defining hit and established her as a national star, and later albums such as "Palette" (2017) and "Lilac" (2021) drew both commercial success and critical praise for their introspective songwriting. Beyond music, IU has built a parallel career as a lead actress in Korean television dramas. With a long run of chart-topping releases and a reputation as a self-driven artist, she is widely regarded as one of the defining soloists of her generation and one of the most influential female artists in Korean pop.