After being involved in a car accident, Si-hyun is left with no memories of the accident or her past. The accident causes her to see sounds in color which is often disorientating, forcing Si-hyun to protect her ears. She encounters Ji-won in the hospital and moves in with her when she is later discharged. Upon hearing Si-hyun humming a strange melody in her sleep, Ji-won's brother, Woo-hyuk, writes it down as a score and gives it to her, hoping that it would help her remember something of her former life. Meanwhile, Jee-il, a failed songwriter stumbles upon this score and offers to find the melody. They embark on a healing journey as they collaborate to complete Si-hyun’s melody.

Min-soo has lost his job to a very awkward moment. His fiancé is planning to built her own café with his help. Min-soo searches everywhere but all his efforts are unsuccessfully. Therefore his soon to be brother-in-law is able to help. He recruits Min-soo for the organization he is working for. As a mechanic, Min-soo starts to steal cars, which he is doing very successfully. But on one evening, he gets enraged and kills a man. But Min-soo isn't shocked or sad, he is getting curios and starts to enjoy violence and murder. Finally, his fiancé learns about his unemployment and threatens to leave. She doesn't know about Min-soo's dark side, which is now fully breaking loose. Written by Anonymus