Lee Hae-sun

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...

Children who live in hiding with superpowers, along with their parents who live with painful secrets of the past, face enormous dangers together.