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Mijoo, who misses her dead grandfather, spends the day alone in the country house where her grandfather lived. While she is riding a bicycle, her grandfather appears in front of her, and Mijoo is confused about whether it is a dream or a reality.
A mother, Soon-hee, and her son, Hae-seok, lived in a village for a long time. One day, they are told that sea levels have risen and that they have to leave the village. They begin to learn how to swim together to stay in the village. Meanwhile, Soon-hee's friend Bok-young gives Soon-hee something to help her swim...
