A woman in her thirties who works as an NHS nurse in London shoulders a delivery-platform bag every Thursday evening. Her hospital pay has barely moved in three years, while average rents in London have climbed by nearly 30% over the same stretch. She put it to the BBC this way: "I'm in survival mode." It was an admission that she had taken on a second job not to build a better tomorrow, but to cover this month's bills.

If this story were heard only in London, it wouldn't have made headlines. In its report, the BBC traced the rising number of multiple-job holders not just in the UK but across the United States, Canada, and Australia, pointing to a shared backdrop: a higher cost of living and growing job insecurity. Korea is not outside this current. According to Statistics Korea, the number of people holding side jobs topped 600,000 in 2024 — the highest figure since the agency began tracking it. A great many of them did not take that path by choice.

A Second Job Filled the Space Inflation 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 Korea rose by nearly 13% cumulatively, and wage growth over the same period failed to keep up. Fixed costs didn't shrink. Add rent, groceries, phone bills, and insurance together, and it's not unusual for a household to be spending close to 60% of its disposable income. A second income was an adjustment to balance the books right now.

The way platforms have lowered the barrier to entry can't be left out either. Delivery riding, freelance talent marketplaces, online storefronts (smartstores), short-form channel monetization — setting up a single side gig used to take months and upfront money. Now there are routes that let you start earning the next day with nothing more than a smartphone and a bank account. Where there is pressure and a path is laid down beside it, people take the path.

The multiple-job holders the BBC interviewed said they had weighed other options before settling on a second job. They cut their spending, looked for better-paying work, and drew down their savings. Only when none of that worked did they turn to a second job. That sequence reveals this was less a move to seize an opportunity than a decision reached after every other exit had closed.

When the Korea Employment Information Service surveyed people on why they took side jobs, "to make ends meet" ranked higher than "self-development" or "building up spare cash" — and that fits squarely with this context. More often than not, the second job functions as a means of survival rather than a vehicle for self-fulfillment.

What Happens When You Lose an Hour of Sleep

There is a more optimistic way to read the multi-job phenomenon. Side-job experience can build skills that differ from those of the main job. Filing taxes, handling customers, developing a feel for running digital channels — these really do sometimes become a springboard for striking out on your own or switching careers. Some labor researchers describe the multi-job track as a fast route to building portable skills you can carry anywhere. Among freelancers in their twenties and thirties in particular, plenty deliberately take on 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 more than an hour less, on average, than those with a single job. Less sleep means weaker focus and judgment. The pattern of performance slipping in both jobs at once, while a person works two places, lines up with exactly what that data predicts. Cases that end in double burnout are as common as cases of real financial gain. The chronic anxiety of doing neither job well gnaws at a person longer than financial pressure does.

Korea's legal framework deserves a note as well. Civil servants and some full-time employees are barred from holding a second job under their workplace rules, and platform workers easily fall into the blind spot of the four major insurances (national pension, health, employment, and workers' compensation). Once side-job income exceeds 500,000 won a month, an obligation to file a comprehensive income tax return the following May kicks in. People who jump in unaware of this and then get hit with back taxes and penalties all at once are not rare at all. Unless you confirm beforehand that a filing obligation rides along with the second income, the attempt to climb out of survival mode can sink you deeper into tax trouble instead.

Direction Matters More Than the Number of Channels

For sole proprietors and freelancers, this conversation has a slightly different texture. For them, multiple income streams are often the default setting from the very start. Rather than leaning on a single client, they spread their income channels across several places — and many already work exactly this way.

The trouble comes from somewhere else. Having many income channels and having a direction are not the same thing. When you stay stuck maintaining N channels while growing none of them, a stretch arrives where being busy and growing become impossible to tell apart. If that busyness drags on for more than two years, the busyness itself starts to act as a screen that keeps you from seeing your actual situation.

In a book about the second act of life after retirement, the author keeps returning to one question: "What are you trying to move away from, and what are you trying to move toward?" In the debate around multi-jobbers, that question still holds. A second job begun to get away from where you are now, and one begun because there's a direction you actually want to head, will trace very different paths a year later — because the first has no destination and the second does.

There are a few things worth sorting out in advance before taking on 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 central work I'm already doing? When does the income actually arrive, and can my cash flow hold until then? Have I checked, ahead of time, the tax-filing obligations that come with side income of this size? Skip this groundwork, and you may run into the paradox of adding a new income channel only to slow the whole business down.

The London nurse's choice was what she needed to get through right now. No one is in a position to fault that decision. But if she is still in the same spot five years from now, that is survival mode hardening into a way of life.

I want to be clear that I don't see multi-jobbing itself as the problem. The distance between someone who knows why their second job began and which way it points, and someone who doesn't — over time, that gap shows up as something far larger than a difference in income.