A missing person case involving a female university student and the victim in a hit and run case appears to be the same person. Detectives look for a witness. A witness, Min Soo-Ah appears, but Min Soo-Ah is blind. She used to be a promising student at the police academy.

With her acute senses, Min Soo-Ah is able to reveal important clues on the hit and run case. Another witness, Kwon Gi-Seob then appears. Gi-Seob, who witnessed the case with his own eyes, gives contradictory statements to Min Soo-Ah. The investigation then goes through many twists and turns, while Min Soo-Ah finds herself up against the killer.