Menarik sangat cerita ini. Ia mengajar kita tentang prinsip dan juga cara kita melakukan sesuatu perkara. Adakah kita akan melakukan perkara yang salah demi menegakkan kebenaran atau memperolehi sesuatu..
Matlamat tidak akan menghalalkan cara. Setiap keburukan pasti akan terbongkar..
Kerja kumpulan dan saling mempercayai adalah sangat penting.
Eun Dae Gu (Lee Seung Ki), Uh Soo Sun (Go Ah Ra), Park Tae Il (Ahn Jae Hyun) and Ji Gook (Park Jung Min) - otherwise known as the P4 - are the new recruits in the violent crime unit at Gangnam Police Station. These rookies are neither enthusiastic nor passionate about their new jobs and have joined the crime squad for varying but unbefitting reasons. They are lead by an erratic and hot headed Seo Pan Suk (Cha Seung Won) who wants nothing more than to wash his hand off of the incompetent new recruits. This drama follows the journey of these young cops as they fumble, learn, fall in love and find their way to becoming people the citizens can trust.
- Lee Seung Ki as Kim Ji Yong / Eun Dae Gu
- Ahn Do Gyu as young Ji Yong
- Cha Seung Won as Seo Pan Suk
- Go Ah Ra as Uh Soo Sun
- Ji Woo as young Soo Sun
- Ahn Jae Hyun as Park Tae Il
- Park Jung Min as Ji Gook
- Sung Ji Roo as Lee Eung Do