P4: are the new recruits in the violent crimes unit at Gangnam Police Station. The journey of four young cops as they fumble, learn, fall in love and find their way to becoming people the citizens can trust.
Lee Seung-gi
Eun Dae-gu / Kim Ji-yong
Cha Seung-won
Seo Pan-seok
Go Ara
Eo Soo-sun
Ahn Jae-hyun
Park Tae-il
Oh Yoon-ah
Kim Sa-kyung
Seo Yi-sook
Kang Seok-soon
Lee Yi-kyung
Shin Ki-jae
Im Won-hee
Cha Tae-ho
