Story Rooftop

A series of disappearances take place in Gangnam, Seoul. Jae Hui works for a famous bar in Gangnam and she knows a secret involving the series of disappearances, but she also disappears. People who become involved with the case include Detective Kang Dong U, who was demoted and then returned to work, Gangnam outlaw Yun Gil Ho, who put himself on the list of suspects, and Prosecutor Min Seo Jin, who works on this case as an opportunity to raise her status. They chase after the truth of the case for different reasons. (Source: AsianWiki)

An ex-police officer embarks on a single-minded goal upon leaving jail, after serving a sentence for crimes committed under dubious circumstances.