The Good Detective (2020) – Dramacool

When doubts arise about a five-year-old murder conviction, a veteran detective partners with a young hotshot to hunt down the case’s hidden truths.

Kang Do Chang is an 18-year veteran detective who one day, arrests an alleged murderer named Lee Dae Chul. The court later sentences him to death but when reviewing the file of his case, Do Chang discovers evidence that would clear Dae Chul.

With time is running out as the mounting evidence threatens to expose the error, Do Chang is caught between seeking power and seeking justice when he meets Oh Ji Hyuk, an elite detective from the police force. These opposites partners begin working together.
(Source: Wikipedia, JTBC, Netflix)