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.
as Eun Dae-gu / Kim Ji-yong
as Seo Pan-seok
as Eo Soo-sun
as Park Tae-il
as Kim Sa-kyung
as Kang Seok-soon
as Shin Ki-jae
as Cha Tae-ho
as Ji Gook
as Yoo Ae-yeon
as Shin Ji-il
as Jo Hyeong-Chul
as Sin Yoon-jeong's mother
as Prosecutor
