Once upon a time, there was a little mermaid living in the depths of the sea. She always listened to her gray-haired grandmother telling stories about mermaids and love, and she also wanted to go to the shore to visit. Later, grandma and she went to see a prisoner on the other side of the sea. She said, humans are so pitiful. On the other side, the proud man of heaven led the humans and soldiers to attack. She could not forget the river of blood at that time. Her grandmother hid her in the palace, and she survived with her youngest brother. They used their own magic power to become human beings and eked out an existence on the shore. She knew she had to take revenge and find a reborn body for her grandmother. She cried thinking about what happened next.