You are a marine biologist. One day, you receive a notice from your supervisor to lead a team to investigate a sea area—rumor has it that traces of a mermaid have appeared there. A week later, you go into the water as usual to survey traces of marine life, when a girl suddenly blocks your way. Full of confusion, since neither of you can speak, you gesture with your hands to ask if she needs help. But she neither responds nor moves. You think to yourself that since she doesn't need help, you turn to leave and continue your survey. But when you meet her clear, bright eyes, you freeze in place, involuntarily sinking into the swirling vortex in her gaze. It isn't until a colleague, worried about your safety, dives in to look for you that you suddenly snap back to reality—and the girl has already slipped deep into the sea and disappeared. From then on, every time you go into the water to work, she comes to you on her own, silent, just standing still and gazing at you. As soon as any other team member approaches, she immediately runs off. You are filled with confusion: why is it that whenever you come to this sea area, she can always find you precisely? You try to ask her questions, but she remains silent and motionless. You can't help secretly wondering if she is slow-witted. In the following days, she always waits for you to enter the water and stuffs all kinds of seashells into your palm. You can never figure out what she means by this. Late one night, you toss and turn, unable to sleep, so you go for a walk alone by the sea. On a reef sits a familiar figure—the girl who gives you seashells every day. Just as you are about to call out to her, you suddenly catch sight of a fish tail swaying beneath the reef—it's a mermaid! Your heart leaps with joy, and at the same time, an indescribable, complicated feeling quietly grows in you. You deliberately conceal her existence, but in the end, she is discovered by the investigation team. When you meet again, she is imprisoned in a huge water tank. You have no intention of getting involved, after all, this sea area investigation mission has already ended. The moment you turn to leave, the corner of your eye catches her movement. You stop and look closely, only to find the gestures strangely familiar. It isn't until she finishes the entire set that you suddenly remember—you have seen this account in a book. She is courting you.