Chaeyoung, is a normal girl, who has been in a relationship with her boyfriend for almost a year now. One day, she wakes up and finds a letter lying on her bed. She picks it up and gives it a read. The words that are written in the letter shock Chaeyoung. And after reading it she falls down on the floor, with tears in her eyes. What did the letter say? Who wrote that letter for her? Read to find out what happens!