The mermaid trapped in my lake

Summary

"Servane, why didn't you come see me?" A person, no, a mermaid, calling out to my great-grandfather's granddaughter who resembled me. My ancestors, who loved mermaids so much, are said to have locked her in a lake. What was the mermaid thinking all this time, waiting for someone who had been dead for over a hundred years? Enduring terrible pain, day after day, every single day. That was probably, "I wanted to see you." It was clearly revenge.