Jung Heeyoung was the famous singer who was confused about her past life. She had lost her memory without knowing anything about why she was like that. Lee Hyunseung the transferred student brought same identical as Heeyoung's late boyfriend gave more confusion to Heeyoung's life. The weird dream started to hunt Heeyoung after Hyunseung's appearance. The truths of Heeyoung's past life reveal themselves one by one. There's a maniac behind all these scenarios. Heeyoung and Hyunseung try to assemble all the clues and significant moments to piece together the lyrics that were left by Lee Hyunsik. They believe that Hyunsik was behind everything and are trying to prove that Heeyoung's family is in danger. At the same time, they must produce the song that Hyunsik wrote. Many missions were given, and they both tried to solve them together and reveal the truth. The youth was wasteful for revealing the truth..