Jessica Jung wasn’t the typical sweet, teenage girl on the street of Seoul. Respectful, kind hearted or approachable was never the adjectives used to describe her. Being a troublemaker was her full-time occupation and she was often spotted hanging out with the wrong crowd. On a drunken night out, Jessica was killed on the scene in a freak accident. After her death, Jessica was denied entrance into heaven and instead was punished in hell where she had to complete missions that required her do good deeds by helping those in need. Jessica now live her life as a devil, along with her other 8 best friends – Taeyeon, Tiffany, Sunny, Hyoyeon, Yuri, Sooyoung, Yoona and Seohyun (all 9 girls are devils). But being a devil certainly did not stop her from causing havoc. 

Vernon Chwe lived most his life in the States. He was the typical spoilt, bratty kid who got everything he wanted. But when he was forced to move to Korea because of his father’s new job, all hell broke loose. Hating the idea of leaving his party life in the US behind, he plans on causing enough trouble in Korea so that he could be sent back to the States to live with his aunt. 

What happens when Jessica was assigned to stop Vernon from going down the wrong path? What happens when these two hot-headed people meet? What kind of disaster will the two create?