The Devil - Season 1 (2007)

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Now certain that there is a connection and a mastermind behind the murders, Kang Oh Soo tries to get cooperation from Oh Seung Ha.

Now certain that there is a connection and a mastermind behind the murders, Kang Oh Soo tries to get cooperation from Oh Seung Ha.

While continuing to chase leads, Kang Oh Soo is forced to deal with a darkest part of his past.

Kang Oh Soo is able to find the person who killed his friend Dae Sik and again the suspect turns out to be a Oh Seung Ha client.

Detective Kang Oh Soo confronts the person he thinks is responsible for the murders, and asks for revenge to be taken out on him.

Reporter Sung Joon Pyo has been paying close attention to the murder cases and is himself linked to what happened those many years ago.

Kang Oh Soo continues to struggle with his past as the murders and threats continue to get closer to home.

Reporter Sung Joon Pyo thinks he may have found the missing link of everything going on and confronts the possible mastermind on his own.

Kang Oh Soo investigates Reporter Sung Joon Pyo's death and can't figure out how his friend might be involved.

While investigating the death of Sung Joon Pyo, Kang Oh Soo finds out that Sung Joon Pyo extorted money from his dad 12 years ago and was at it again.

Though Kang Oh Soo is injured while investigating the murder cases, he feels that he is getting close to finding the mastermind behind it all.

The clues towards the mastermind seem to be pointing in one direction... a dead man, Jeong Tae Seong.

Another friend, Sun Ki, has been murdered and one of Kang Oh Soo's few remaining friends, Suk Jin, is the main suspect.

To prove his friends' innocence Kang Oh Soo has to seek help from Oh Seung Ha.

Kang Oh Soo finds Suk Jin's alibi but it will have ramifications he didn't expect.

Tragedy finally reaches Kang Oh Soo's family. Its time to settle things with Oh Seung Ha once and for all, man-to-man.