However, a horrific car accident which killed her fellow orphanage "brother' Dong-hyun caused her to lose her eyesight totally by retinal damage (her eyes look outwardly normal).

Then her police career ended, supposedly not because of her blindness but because she left training and cuffed her brother to the car against procedure, which contributed to his death.

Soo-ah reveals to Detective Jo at the police station that on the night of the hit and run case, she was picked up by a taxi cab driver.

Detective Jo and Soo-ah then work together to find the taxi cab driver, but all their leads turn up empty.

Meanwhile, Soo-ah finds herself being stalked by a mysterious man who turns out to be the killer, gynecologist Dr Choi Myung-jin.

Soo-ah, while in the car with him, remembered that he had a strong scent, he had a watch on his right hand, and he gave her an iced coffee drink in a glass can.

He guides her out of the subway and to safety, as well as her seeing eye dog, Seul-gi ("Wisey" in the English subtitles).

Gi-seob goes upstairs and fights the killer while Soo-ah runs away, reaching the car and breaking its windows with the motion sensor.

The police find Detective Jo's body and other evidence implicating Dr Choi Myung-jin as the killer, e.g. a two young women in his basement, one captive and the other dead.

"[4] A Chinese remake titled The Witness starring Yang Mi and Luhan and also directed by Ahn Sang-hoon, finished filming in 2015.

"Sightless Witness"), directed by Junichi Mori, starring Riho Yoshioka and featuring Mahiro Takasugi, Kōji Ōkura, and Kōdai Asaka, was released in Japan on 20th September 2019.