끝내 너에게 빠지고 말았어

The line, explained

Some love songs celebrate falling. Others confess it, with the air of someone who held out as long as they could. Today's line is the second kind, and its grammar, -고 말았어, carries the whole story of a struggle lost. It says: I did not want this, I fought it, and it happened anyway. You will hear it in ballads, in drama narration and in everyday complaints about eating the whole cake.

끝내 means 'in the end, finally, at last', built from 끝, 'the end', and 내, 'throughout'. It implies a long stretch of resistance before the result. The ㅌ of 끝 nasalises before the ㄴ, so it sounds like kkeun-nae. 너에게 is 너, 'you', with 에게, 'to' (used for people and animals). 너한테 means the same in casual speech, but lyrics often prefer the slightly softer, more written 에게.

빠지고 comes from 빠지다, 'to fall into'. You can 빠지다 into water, into a hole, into a habit, and into a person. 사랑에 빠지다 is 'to fall in love', and 너에게 빠지다 is 'to fall for you'. The verb already suggests losing your footing, which is perfect for this line. Then -고 attaches to the stem with no changes at all: 빠지고. This is where the grammar begins.

말았어 is 말다 in the casual past. On its own 말다 means 'to stop, to quit'; it is the same verb in 가지 마 (don't go). But after -고, it means 'and ended up, and it came to that'. 빠지고 말았어 is therefore 'ended up falling'. The ㅆ links into the final vowel, so you hear ma-ra-sseo. Compare 빠져 버렸어, which also means 'I fell', but stresses that it is done and final rather than that I resisted.

Swap the verb and keep the confession: 끝내 너에게 들키고 말았어 (in the end you found me out), 끝내 너에게 지고 말았어 (in the end I lost to you), 끝내 너에게 무너지고 말았어 (in the end I crumbled before you). Turn it to the future and the mood flips completely: 너를 꼭 잡고 말겠어 means 'I will catch you, whatever it takes'. Same ending, from surrender to determination.