The series is about an elite high school being engulfed by a mysterious homemade cookie that makes desires come true with just one bite. However, having more than one cookie can cost one their life. After Choi Soo-young (Nam Ji-hyun)'s sister falls prey to the cookie and goes into a coma, she pretends to be a student at Jeonghan High School to find the antidote as well as the Chef, the maker of the cookies.
