Was it Park BoGum's idea to appear on ”Music Stage”? IU: ”It's a genius idea, I'm impressed”

Behind-the-scenes footage of actor Park BoGum and singer/actress IU's appearance on "Music Stage" has been revealed.
On the 12th (today), IU's YouTube channel "Ijigeum" posted the following message:
TV] A video titled "It's fun just to look at his face, Kwangshik's office visit vlog (feat. Song Stage)" was posted.
The video featured IU and Park BoGum, who star in the Netflix original "Thank You." IU
"I'm on my way to Kwangshik's (Park BoGum) office right now. I'm preparing an interesting promotional event and I'm going to practice. I'm going to other artists' offices like this.
"I wonder how long it's been. I'm looking forward to visiting my friend's office," he said. (Park BoGum's office) THE BLACK
IU arrived at the LABEL building. On this day, the two practiced their duet performance on the "Music Stage."
When asked why, Park BoGum replied, "I think that 'Thank You' is a TV series that everyone can watch regardless of age, so I think that 'Music Stage' is not only popular in Korea, but also among people living overseas.
Apparently Korean people can also watch it. Our story is a mix of stories that evoke old sensibilities and stories about living in the present, so it is something that everyone can enjoy and feel warmly about.
I thought it would be a show that people would watch." IU responded, "I think it's a genius idea. No one has tried this before. It's the first time we've ever appeared on 'Music Stage' to promote a TV series.
"I think it was the first time," he said. "At that time, Bo-gum seriously told me, 'Jieun, let's work hard on our promotions.' We still had a while until the promotion period.
On the day of the shoot for "Music Stage," IU was asked how she felt about being on stage for a music show after a long time.
He replied, "Since it's a music stage, I'm a little nervous. I just went around with Bo-gum to greet the (seniors)."
After the shoot was completed, IU said, "To be honest, I was very nervous. But Bo-gum was very enthusiastic about this.
"It was the best I've ever practiced," she said, adding, "I was the most nervous I've ever been on stage. I was the most nervous since my debut."