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Geudael bomyeon gaseumi dugeun dugeun
Again "Geudael" is a sweet way to refer to the person you like. "Bomyeon" means 'when I see you' or 'if I look at you'. "Gaseumi" refers to 'chest' or 'heart'. "Dugeun dugeun" is a Korean sound effect equivalent to 'thump thump'. All together this lyric means: When I see you, my heart thumps. "My" in this lyric and the first is assumed.