"The Legend of the Gyeryong Fairy," adapted from the webtoon of the same name, is a fantasy romantic comedy that tells the story of a 699-year-old Gyeryong Mountain fairy who lived through the Goryeo and Joseon eras and two "husband candidates" living in the modern era. Moon Chae-won plays the fairy Sun Ok-nam in the play. She lost her wings at the Fairy Falls and could not return to the sky. After that, she has been waiting for her husband to reincarnate for 699 years. She works as a barista at the "Fairy Tea House" on Gyeryong Mountain. She is loved by people around her because of her gentle, warm and funny personality. She has been waiting for her husband to reincarnate for hundreds of years, making coffee in a coffee shop at the foot of Gyeryong Mountain. When a man who might be her husband appears, she leaves Gyeryong Mountain for the first time. In order to see her reincarnated husband again, she enters civilized society and unfolds a tortuous story to adapt to life in Seoul. Not only that, in the eyes of ordinary people, Sun Ok-nam is an ordinary old lady, but in the eyes of those who are destined to be with her, she is a beautiful fairy. The secrets of the fairy Sun Ok-nam will also bring interest to the plot. Yoon Hyun-min will play a biology professor who has outstanding looks and brains but complains about everything and has an unusual obsession with cleanliness.