로구나

'Ah, so this is X!' realization

-로구나 marks the moment something clicks: 아, 이것이 '평화김해뒷고기'로구나 'ah, so this is Pyeonghwa Gimhae Dwitgogi.' It attaches to nouns; after a verb or adjective the same realization comes out as -구나. The tone is theatrical and a little old-fashioned, which is why most of these lines are on-screen captions playing up the discovery.

Register: exclamatory, slightly archaic