If you’ve ever watched a Korean drama, worked at a Korean company, or even played a Korean mobile game, you’ve heard these words. They sound simple — “you worked hard” — but they carry so much more cultural weight than a direct translation suggests.

In Korean culture, effort and hard work are deeply respected. It’s not just about the result; the struggle, the process, the time invested — all of that matters. So when someone says 수고했어요 at the end of the day, they’re not just acknowledging a task completed. They’re saying: “I see what you went through. I recognize your effort. Thank you for that.”

The two phrases are closely related but have slightly different nuances:

• 수고했어요 (sugohesseoyo) — focuses on the effort and trouble someone took. The word 수고 (sugo) means “effort, pains, trouble.” This is the more everyday, versatile version. You can say it to a colleague leaving work, a delivery person, or a student finishing an exam.
• 고생했어요 (gosaenghesseoyo) — emphasizes hardship and suffering through difficulty. 고생 (gosaeng) implies that the work was genuinely tough. You’d use this when someone went through something particularly hard — long overtime, a difficult project, or recovering from illness to get the job done.

Think of it this way: 수고했어요 is like “Good work today!” while 고생했어요 is more like “That must have been rough — I respect how hard you pushed through.” Both are warm and appreciative, but the second packs a little more empathetic punch.

There’s also a fascinating social layer here: in Korean hierarchical culture, who says it to whom matters. Traditionally, a senior person says 수고했어요 to someone junior or equal — not the other way around (more on that in the mistake section below). But in modern, casual workplaces this is becoming more flexible.