어서 남다

be left over because of something

남다 is being left over — food nobody ate, the leftover mash after tofu is made, time to spare because you started the day early, profit left after a redevelopment. -어서 gives what caused the surplus. In a couple of lines it is simply what remains rather than an excess: the topic still on the table, a relationship that has lasted because both sides meant it.

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