A pawnbroker is found murdered in a remote town. Police suspect that he was murdered by an acquaintance, as even the most experienced investigator on the case could identify no signs of resistance. Three people come under suspicion but all of them have perfect alibis and the investigation comes to a standstill. One year later, one of them is found dead and the original murder case becomes even more mysterious. Almost fifteen years pass and the lead inspector, now approaching retirement, reflects on the only case he could not solve in an otherwise successful career. Haunted by a sense of responsibility and guilt that he caused suffering by letting the murder case go unsolved, he decides to re-investigate. His persistent search brings attention to the long forgotten case and reveals a hidden relationship between the victim's son and the neighborhood woman's daughter. As their love grows, more crimes happen. As their sin grows, the inspector's chase comes closer to them.
- Other name: 백야행 : 하얀 어둠 속을 걷다,백야행 - 하얀 어둠 속을 걷다,백야행,Baekyahaeng,Baekyahaeng: Hayan Eodum Sogeul Geonda,Into the White Night
- Genre: Drama, Mature, Murder, Mystery, Serial Killer, Suspense, Thriller
- Status: Completed
- Duration: N/A min
- Country: South Korea
- Network: N/A
Cast: Bang Joong Hyeon, Go Soo, Han Cheol Woo, Han Kook Jin, Han Seok Kyu, Hong Ji Hee, Im Jeong Woon, Jang Hyeon Jeong, Jo Kyeong Sook, Jo Seok Hyeon, Jo Yeon Ho, Joo Da Yeong, Kim Seong Oh, Kim Yeong Seon, Lee Jae Goo, Lee Jong Won, Lee Min Jeong, Oh Sang Ho, Park Seong Woong, Seo Dong Soo, Seo Jin Won, Son Ye Jin, Yoon Da Kyeong