Less than Evil
나쁜 형사 (original)
Woo Tae Suk is an experienced and well-established detective with a long professional career, but in spite of everything he is a lonely and bitter human being. It all has to do with him only focusing on solving cases, while his actions are completely controversial because it crosses the line between good and evil. Woo Tae Suk crosses paths with a psychopath, but he cannot arrest her because of lack of evidence. The woman eventually decides to help Woo Tae Suk solve other cases.
Starring Shin Ha-kyun, Lee Seol, Park Ho-san, Kim Gun-woo, Baro, Bae Da-bin, Bae Yoo-ram, Yang Jae-Young, Yoon Hee-seok, Ryu Tae-ho
It's a drama and crime show, and has a rating of 7.2 out of 10 from Imdb which is usually fine for this kind of show.
Watch it here
Not found streaming from United States.