Na-young (Quan Duyan), who is in her 20s, has a stable life and work, but her relationship with her mother is not so good that she and her daughter are not close to each other. But their father's sudden departure made their home lose peace. She left her mother and went to the island where her father once lived. on this beautiful island, she met a girl Yeon-soon who looked exactly like herself. There is a sharp contrast between Yeon-soon 's happiness and Na-young 's loss. As she gets along, Na-young finds out who Yeon-soon really is, which makes her surprised.
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