Because Sister Saoirse is the last seal spirit remaining in the human world.
Due to the expansion of human activities, environmental pollution and the surges of history, the elves no longer adapted to life in the human world and left the human world. They are either gone or turned into stone sculptures. just like in the cave. Like the three white-bearded old men, only the sound of the conch shells of the seal spirits can wake them.
As the daughter of a human and a seal elf who inherited the talent of a seal elf, her younger sister Saoirse has been unable to speak since she was a child, she is therefore often ostracized and intimidated by it. brother. But sister Saoirse, who could not speak, smelled the white conch left by her mother, took it from her brother, blew the conch and returned to the sea. Because Saoirse discovered the clothes of the seal elf, she was forced to bewas taken to her grandmother's house in town by her father and Ben, but unfortunately she was captured by an owl.
In the owl's house, the brother discovered that the sound of the conch could treat the owl, so he blew the conch himself, but he found that it was useless and that the sound he blew had no such sound. magic. It turns out that except for my sister Saoirse, no one can wield the power of the conch, because she is the last life of the seal spirit left in the human world. Saoirse will become physically weak from using too much magical power and can only recover by donning the seal spirit cloak and returning to the sea.
Precisely because Saoirse inherited the talent and blood of the seal elf, the conch sound it makes can defeat the owl, save those elves who have turned into stone sculptures and cannot go back, and can bring back the emotions that belongnt to everyone in everyone's heart.
At the end of the story, the mother came back because of her sister's singing. She asked her sister if she wanted to return to the elves with her, but the sister chose to stay in the human world with her. her brother and her father who grew up with her. Eventually, my mother left with the remaining elves from the human world.
From that moment on, my sister truly became a human being, and she could no longer blow the white conch that belonged to the seal spirit.