Nalanda, a country where mermaids lived in the sea once upon a time. Yeon-Ji, who has been dreaming of mermaids since she was little, entered as an intern at the Nalanda History Research Institute to prove the existence of mermaids. She meets the team leader Hae-Rang who looks like a mermaid. Yeon-Ki, who wants to look good in front of Hae-Rang, tries her best, but Hae-Rang keeps being cold... (Source: BOMTOON, translated) (Note: Chapter count includes three side stories.)