There are few designers in Sweden with more integrity and street cred than Ann-Sofie Back, who has maintained an unwaveringly indie approach to fashion for more than 18 years. “I have always done what I wanted to,” this graduate of Beckmans College of Design and Central Saint Martins once declared. And she continues to do so. On Monday, August 29, the designer will be turning over her BackDoor store to Yung Lean (aka Jonte, aka Jonatan Leandoer Håstad) and his crew for a 12 hours by-invitation event. Clearly, not all the action at Stockholm Fashion Week will be on the runway. This isn’t the first collaboration between Back and Young Lean. Curious as to how these two creative Swedes came to work together, we reached out by email to Back for the backstory.

How did you become familiar with Yung Lean?

That was you, Laird, when we met in January and you told me you had just done a feature about him for Vogue.com—or that’s when I started listening to his music. I heard about him maybe a couple of years before from my friend’s daughter. I might be his oldest fan. He might be the reason I use headphones at all.

How would you describe his work and what is its appeal to you?

I like that the melodies sound like they’re backward and that the song doesn’t follow the melody—everything is a bit off and melancholic. I also like that he is difficult to define, both the music and Jonatan himself as a person; he is complex. I have a lot of respect for him.

When did you do your first pop-up together?

Last spring, the Sad Boys borrowed our showroom and had a one-day pop-up selling their merchandise. I had actually forgotten about it when I arrived at the office in the morning and was a bit perplexed about the queue of young men outside the office. I walked downstairs and this nondescript young guy was making coffee in the kitchen and introduced himself as Jonatan and told me his mum loved Back, she was “all Back-ed up.” Very polite. I had no idea what Yung Lean looked like and thought maybe we had a new intern.

How did this upcoming takeover come about?

He-he, our Fall ’16 collection hasn’t arrived yet from production. When you are running a small business you have to trolla with your knees—look it up. [We did! Trolla med knäna translates loosely as, “Do the impossible.”] So we asked if they wanted to take over the whole store for a day. We’re planning to present the Spring collection in Paris instead of Stockholm.

What commonalities do you share with Jonte and Sad Boys?

We don’t fit the box. We are more well-known outside of Sweden—I was before and he is now. I see fashion as masquerade and his character Yung Lean has a different personality and views to Jonatan himself.

What do you feel this event will add to SFW?

I can finally get his autograph and adopt him.

This interview has been edited and condensed.

BackDoor is at Skånegatan 61, Stockholm.