괜찮아, 난 괜찮아

The line, explained

You already know this word even if you have never studied Korean. 괜찮아 — gwaen-cha-na — is in every drama, every ballad, every reply to 'are you alright?'. This line repeats it twice, and the repetition is the whole point.

괜찮다 means 'to be okay, fine, alright'. Drop 다 and conjugate casually and you get 괜찮아. It is wonderfully flexible: 괜찮아? (are you okay?), 괜찮아 (I'm fine / it's fine / no thanks), 괜찮아요 (the polite version you'd use with a stranger). Offer a Korean friend more food and 괜찮아요 means 'no, thank you'.

The small word in the middle, 난, is 나 (I) fused with the topic marker 는. The topic marker tells the listener 'here's what I'm talking about now'. So 난 괜찮아 is 'as for me — I'm okay', which quietly implies a contrast: whatever is happening, whatever you're feeling, I'm fine.

That is why the line works in a ballad. The first 괜찮아 reassures someone else: 'it's okay'. The second, with 난, turns inward: 'I'm okay'. Sung by someone who clearly isn't, it lands like a brave face slipping.

Pronunciation tip: 괜찮아 is three syllables, gwaen-cha-na. The ㅎ in 찮 is silent here, and the ㄴ carries over to the final 아, which is why it sounds like 'cha-na' and not 'chan-a'.