A woman in her thirties who works as an NHS nurse in London straps on a delivery-platform bag every Thursday evening. Her hospital pay has barely moved in three years, while average rents in London have climbed by close to 30 percent over the same stretch. She told the BBC: "I'm living in survival mode." It was an admission that she had taken a second job not to build a better tomorrow, but to cover this month's bills.
If this story were only being heard in London, it wouldn't have made news. In its reporting, the BBC looked beyond the UK to a rising tide of multiple-job holders in the United States, Canada, and Australia, pointing to a shared backdrop: the rising cost of living and job insecurity. South Korea is not outside this current. By Statistics Korea's count, the number of people working side jobs topped 600,000 in 2024 — the highest figure since the agency began tracking it. A great many of them did not jump in by choice.
A Second Job Filled the Gap Prices Opened Up
The most direct driver behind the rise in second jobs is the cost-of-living gap. Between 2022 and 2024, consumer prices in South Korea rose by nearly 13 percent cumulatively, while wage growth over the same period failed to keep pace. Fixed expenses didn't shrink. Add up rent, food, phone bills, and insurance, and it's not unusual for a household to be spending close to 60 percent of its disposable income before anything else. A second income was the adjustment that made the immediate math work.
The way platforms have lowered the barrier to entry matters too. Delivery riding, freelance marketplaces, online storefronts, monetized short-form channels — setting up a single side gig once took months and upfront money. Now there are paths that let you earn the next day with nothing but a smartphone and a bank account. When a path is laid down where there's pressure, people take it.
The multiple-job holders the BBC interviewed said they had weighed other options before deciding on a second job. They cut spending, looked for better-paying work, and drew down savings. When none of that worked, they moved to a second job. That sequence reveals this was less a choice that seized an opportunity than a decision made when every other exit was blocked.
When the Korea Employment Information Service surveyed people's reasons for taking on side work, "to make ends meet" ranked higher than "self-improvement" or "building up spare cash" — a finding that fits squarely with this context. More often than not, a second job functions not as a vehicle for self-realization but as a means of survival.
What Happens When You Lose an Hour of Sleep
There is also a more positive way to read the multiple-job phenomenon. Side-job experience builds skills different from those of your main work. Filing taxes, handling customers, getting a feel for running digital channels — these things really do, in some cases, become a stepping stone toward starting a business or changing careers down the line. Some labor researchers describe holding multiple jobs as a fast track to building portable skills you can use anywhere. Among freelancers in their twenties and thirties especially, plenty deliberately juggle several projects at once to build a portfolio.
But the data on the other side tells a different story. Studies have repeatedly found that people holding multiple jobs sleep, on average, more than an hour less than those with a single job. Less sleep means diminished focus and judgment. The pattern of working two jobs while performance slips in both at once is exactly the direction this data predicts. For every case that ends in economic gain, there's another that ends in double the burnout. The chronic anxiety of not doing either job properly wears a person down longer than financial pressure does.
Korea's legal framework deserves a mention too. Civil servants and some salaried employees are barred from holding second jobs under workplace rules, and platform workers tend to fall into the blind spots of the country's four major social insurance schemes. Once side-job income tops 500,000 won a month, you incur an obligation to file a comprehensive income tax return the following May. People do, in fact, regularly jump in without knowing this and get hit with the tax and a penalty all at once. If you don't confirm beforehand that a reporting obligation comes attached to that second income, you can end up sinking deeper into tax trouble while trying to climb out of survival mode.
Direction Comes Before the Number of Channels
For sole proprietors and freelancers, this discussion has a slightly different texture. For them, multiple income streams are often the default setting from the start. Not depending on any single client and instead laying down income channels in several places — many people already work this way.
The problem comes from somewhere else. Having many income channels is not the same as having direction. When you stay stuck maintaining N channels and can't grow any of them, a period arrives where being busy and growing become indistinguishable. And once that busyness drags on for more than two years, the busyness itself starts to serve as a screen that keeps you from seeing reality.
In a book about the second life that follows retirement, the author keeps returning to one question: "What are you trying to move away from, and what are you trying to move toward?" That question holds up just as well in the debate around the multi-job worker. A second job started to escape where you currently are, and a second job started because there's a direction you want to go, trace different paths a year later. The former has no destination; the latter does.
There are a few things worth sorting out in advance when you're considering a new income source. Does this work point in the same direction as my core business? How many hours a week can I give it, and is that time being pulled out of the essential work I'm doing now? When does the income actually arrive, and can my cash flow hold until then? Have I checked ahead of time what tax-reporting obligations come with side income of a given size? If you don't get these straight, you can experience the paradox of adding a new income channel only to watch your whole business slow down.
The London nurse's choice was what she needed to survive right now. No one is in a position to fault that decision. But if she's still in the same place five years from now, that means survival mode has hardened into a way of life.
I want to say that I don't see multiple jobs as a problem in themselves. The distance between the person who knows why their second job began and which direction it points, and the person who doesn't — over time, shows up as something far larger than any gap in income.
