Eum Yoonjin and Hwang Inyeop have been dating for six years before getting engaged. Nothing could separate the happy couple apart until one day, a mysterious note arrives in the mail threatening them. As the days pass by, Eum Yoonjin’s life becomes at stake. Suddenly the ‘’secret admirer’’ arrives at her workplace and as she realizes who he is, the memories begin to haunt her. Will Eum Yoonjin and Hwang Inyeop be able to be with each other until the very end?