She retired at 40 — and credits K-pop group BTS for making it happen. How fandom turned into financial freedom

The retirement plan that actually worked for Bernadette Joy wasn't built around a spreadsheet. It was built around her favorite boy band.

Joy, a personal finance expert and author who spent years helping people with their money, retired last year at 40. She and her husband AJ now live on about $6,000 a month — a lifestyle their savings and investments can sustain comfortably. But the clearest financial turning point, she writes in a personal essay for CNBC , came as she was planning to follow the South Korean pop group BTS on their world tour.

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"BTS helped me envision this next step," she wrote. "Attending the shows gave me a specific activity in retirement, which made many of the money decisions easier for me. It also helped me realize that financial freedom isn't about accumulating as much money as possible, but having the flexibility to use my time as I see fit."

By the end of 2027, Joy will have seen BTS perform 20 times on three continents. The cheapest seats were general admission in Brussels, Belgium. She attended her 14th show in Boston and watched AJ make it onto the big screen at their last concert in Munich, Germany.

From $300,000 in debt to retirement at 40

A decade before she retired, Joy was carrying $300,000 in debt. That context makes the trajectory more striking and her framework more realistic than aspirational.

When BTS announced their reunion tour, she opened a dedicated cash savings account called "Tour with BTS" and refused to fund it by selling investments or using credit cards. She budgeted every expense , from tickets, flights and hotels to food and transportation.

That discipline also reshaped how she thought about her broader retirement portfolio.

"Originally, I had planned to just put my retirement money into investments and brokerage accounts," she wrote. "When I realized how much I wanted to see BTS, it was clear that I also needed more readily accessible cash accounts, too. I had to organize my money around the life I actually wanted to live."

Her current portfolio now includes index funds, money market funds, dividend-producing ETFs and other accessible cash income.