When Koo Seo Jin utilizes the authority granted to him as the director of a theme park to shut down Wonderland's well-liked circus, he reaches a new low in his life. Ringleader Jang Ha Na puts up a struggle, refusing to give in to the demands of her icy employer. However, she is taken aback when Seo Jin's secret side exposes itself with true tenderness. In the struggle to save her circus, Ha Na comes to the realization that she must coax Seo Jin's better qualities out of him through enchantment, wonder, and love; the question is, who will listen: Jekyll or Hyde?