IU Wrote a Whole Song for Best Friend Yoo In-na, and It Hit #2 on Charts

IU's new double single arrived on the 10th with a quiet dedication that fans immediately latched onto: in the description for "Dear My Crazy Soulmate," she wrote simply, "To Yoo In-na." Nothing else. No explanation needed.

The two-track digital single, titled From This Star, marks IU's first release since Bye, Summer dropped roughly a year ago. Both titles landed at the top of Korea's major streaming charts after release, with the two songs occupying the #1 and #2 spots, a clean sweep that confirmed anticipation had been building well before the release date.

A friendship that started on a variety show

IU and actress Yoo In-na met in 2010 when they appeared together on the SBS variety program Yeonghogeolgol. Despite an 11-year age gap (Yoo In-na was born in 1982; IU in 1993), the two grew close quickly and have remained inseparable for the 15 years since, often cited as one of the entertainment industry's most enduring celebrity friendships.

"Dear My Crazy Soulmate" is IU's direct tribute to that bond. She wrote the lyrics herself, and the song carries the warmth and specificity of someone writing for a person, not a concept. The mood is playful and tender at once: the kind of track where being a little weird around someone reads as the highest form of trust. It's a surprisingly intimate thing to put on a chart-topping release, and it lands all the better for it.

The photo compilation that followed

On the 15th, IU posted a video to her personal account captioned "Sure YOO IN NA we best soulmate" alongside "Dear my crazy soulmate." The video compiled photos and clips spanning the full stretch of their friendship, from recent years back to noticeably younger versions of both women, including what appeared to be previously unseen shots from a trip to Italy taken about a decade ago.

The footage moved through travel photos, mutual appearances at each other's events, and candid selfies, with lyrics from the song appearing as subtitles throughout. The track played as the background music, tying the whole thing together.

The video closed with the words "Dear my crazy soulmate" over a final image of the two of them together, a small, deliberate ending to what amounted to a 15-year highlight reel.

For fans who have watched this friendship play out across variety shows, award ceremonies, and social media for years, seeing it commemorated in song and then in a personal video felt like the payoff to a very long, very warm story.