tvN An upgraded Romantic Fantasy [The Idle Mermaid] Every Thursday night 11 PM broadcast The 18th Mermaid princess Eileen of Mermaid world who's been admiring the human world. Her hobby is? Studying the human world by a smart phone and looking at charming chef Kwon Si-kyung. One day, Eileen kisses Si-kyung deeply to save him who's fallen to Han River. Oh my god. What is this, a tongue? Si-kyung's left and the only things left to Eileen was the feeling of kiss and Si-kyung's cellular. Eileen decides to be a human in order to meet Si-kyung again! But she needs to go find a scary witch to be a human...