Both have the same level of mystery and twists within the Police Force. Both are stories of detectives chasing after the truth behind an unsolved crime, that took place in the past, through cases that take place in the present.
Both are thriller/suspense dramas in a criminal/detective setting. They both are looking for a murderer, and deal with corruption and hidden organizations.
Both are dramas by the amazing sungmin ahjussi. His beautiful acting captivates me every time, he can control and use all of his being for his acting, the breathing brings so much tension every time