Jisoo is a young Korean girl, five years old. She left the house and went to the sea. She saw Siren injured. She went and got medicine to treat his wound. She came to him and treated him. The Sairen was surprised and thanked her. She had become his friend. When she was fifteen years old, she and her sister went to the sea. They see Siren singing. Hyunjin is a dangerous Siren.