The Merman Trapped in My Lake

"Selvaine, why haven't you come to see me?" a mermaid called out, yearning for my great-grandfather's granddaughter who bore a striking resemblance to me. My ancestor, who had cherished this mermaid deeply, imprisoned him in her lake. What could he have been thinking, waiting for someone who had been gone for over a century? Enduring unbearable pain, day after day. Perhaps his thoughts were simply, "I missed you." But clearly, this is revenge. (Adapted from the original novel and webtoon: Naver Webtoon, Naver Series)