Singer and actor IU appeared on MBC FM4U's "A Perfect Day with Lee Sangsoon," showcasing a reunion with Lee Sangsoon after a long time. The reunion between the two came about nine years after JTBC's "Hyori's Homestay" Season 1 in 2017, and this was their first meeting through a broadcast. The photos released on the radio's official account that day captured a friendly atmosphere, with IU and Lee Sangsoon making hand-heart gestures and Lee Sangsoon imitating actor Byun Wooseok's pose.

On the show, IU and Lee Sangsoon revealed that they had kept in touch consistently, saying, "We talked on the phone and worked together, but it feels like it's been a very long time since we last met." Lee Sangsoon said, "We were both busy. We've been in Seoul for quite a while, but we were busy," and IU said, "I came here today without a second thought because I thought I could see the boss." The moment when IU still called Lee Sangsoon "boss" was also captured.

In the past, IU was caught up in rumors of a rift due to the lack of interaction with Lee Hyori after appearing on "Hyori's Homestay." The rumors were based on the fact that IU did not appear on "The Seasons - Lee Hyori's Red Carpet," hosted by Lee Hyori, that the two did not follow each other on social media, and that Lee Hyori did not show up at IU's concert. However, in October last year, Lee Hyori appeared on the web variety show "Pingegeo" and revealed that IU consistently gave holiday gifts, and through this recent appearance on Lee Sangsoon's radio show, it was revealed that IU has maintained steady contact with the Lee Hyori-Lee Sangsoon couple, putting an end to the rumors.

Meanwhile, MBC's "21st Century Great Lady," starring IU, is set in a constitutional monarchy version of South Korea and depicts a romance where Seong Heeju, a chaebol of commoner status (played by IU), and the king's son (played by Byun Wooseok) overcome social barriers to carve out their destiny. The show will premiere on the 10th at 9:40 PM.