The murder of a newly famous writer, Jin Jin... A detective investigates her 3 best friends from high school whom she planned to meet the day before she was murdered. Jin Jin considered herself Ha Jin's (Yoon Jin Seo) best friend. In fact she liked her so much that she copied everything she did. Tae Suk (Kim Da Hyun) was the handsome, diligent student of the group that had eyes for Jin Jin but Ha Jin liked him also. And Kyung Chul (Lee Shi Un) was the jokester of the group who had eyes for Jin Jin. Was Jin Jin murdered by one of her best friends? If so, why?