Do you believe in mermaids? If not, think again, because mermaids do exist. You may not see it, and lucky are those who have seen it. These mermaids live in the depths of the ocean. They are ruled by a king named Jung Chan. His wife died 12 years ago, leaving him with his daughter, Princess Soojung, who has been longing for a mother's love and care ever since she was 7 years old. Now, the princess, who is 19 years old, has grown to be intelligent, and her beauty attracts everyone. But wait, not all fairy tales end up with "and they live happily ever after," because, before that line, there are still many challenges our main character will face. So tune in for this thrilling, wave-splashing, magical mermaid ride.