he gives up his pursuit of art and tries to find a desk job. Song Jae-rim as Kwon Shi-kyung A famous chef in the human world. Believed to be cold and arrogant, he suffers from prosopagnosia. His father is a diplomat. Park Ji-soo as Yoon Jin-ah Hyun-myung's ex-girlfriend. A former resident of surplus house, she leaves when she obtains a job at JH Food corporation. Supporting Kim Seul-gi as Ahn Hye-young A resident of surplus house. She has a live webcast wherein she eats massive amounts of food for her viewers' pleasure. Hye-young becomes Aileen's friend and confidant when she discovers her true identity. Kim Min-kyo as Do Ji-yong A resident of surplus house. He graduated from the law school of an elite university, then spent the next ten years failing the bar exams. He is addicted to video games, and quickly develops a crush on Ha-ni. Nam Joo-hyuk as Park Dae-bak, aka "Big" A resident of surplus house. He grew up comfortably but has now been cut off by his parents. He is a computer genius. Lee Sun-kyu as Lee Sun-kyu The owner of surplus house. Seemingly an aging slacker, there is more to him than meets the eye. He once was Ma-nyeo's roommate. Jin Hee-kyung as Hong Myung-hee The chairwoman of JH Food corporation, she falls in love with Ma-nyeo. Kim Jae-hwa as Kim Woo-sun A manager of JH Food corporation, she is Jin-ah and Dae-ri's supervisor, and often speaks in French. Han So-young as So Dae-ri An employee of JH Food corporation and deputy section chief under Kim Jae-hwa. Ahn Gil-kang as Ahn Ma-nyeo A witch and former merman, he has become human. After the death of his wife, he runs a takoyaki stall to finance his daughter's studies abroad. Kim Jin-hee as Han Gook-ja Shi-kyung's sous-chef at JH Food. Soundtrack Ratings In this table, represent the lowest ratings and represent the highest ratings. N/A denotes that the rating is not known. International broadcast - Under the title Idle Mermaid, it was aired in the Malaysia on TV9 from February 6, 2018 to February 21 on Monday to Thursday at 6:00pm Malaysia Time - Under the title The Mermaid, it was aired in the Philippines on GMA Network from May 4, 2015 to June 12, 2015 at 5:05pm (PST) replacing Fall in Love with Me. - It was aired in Thailand on PPTV beginning November 1, 2015.