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Jin-wook and Su-min are a long-term couple. They decide to live in a rural pension near the ocean for a month. Then one day, a young woman named Hye-na moves into the same pension. A month later, it's time to leave. Is Jin-wook and Su-min's relationship closer? Or will it break-just like the sound when the waves hit a rock? The ending credits of film go up. And...