Si-hyun who lost all memory after a car accident and has colored hearing in which she can see sounds in colors, tries to complete the melody in her dreams. As the song nears completion, Si-hyun’s fragmented memories return to her.

A mysterious and highly successful hitwoman in Hong Kong is paid to assassinate top-level crime bosses. After beginning a relationship with a noodle vendor, she decides to travel to South Korea to complete one last job. Unfortunately, the dead man’s bodyguard is out for revenge.