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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
Park Jeong-min
Ji Gook
Moon Hee-kyung
Yoo Ae-yeon
Lee Ki-young
Shin Ji-il
Song Young-gyu
Jo Hyeong-Chul
Son Hee-soon
Sin Yoon-jeong's mother
Kim Yun-tae
Prosecutor
