Pemeran Mary Kills People

Lee Bo Young (이보영)

as Woo So Jeong

Pemeran Utama

Lee Min Ki (이민기)

as Cho Hyeon U / Ban Ji Hun

Pemeran Utama

Kang Ki Young (강기영)

as Choi Dae Hyeon

Pemeran Utama

Kang Na Eon

as U Mi [Jae Yeon's friend]

Pemeran Pembantu

Baek Hyun Jin

as Koo Gwang Cheol [Businessman]

Pemeran Pembantu

Kwon Hae Hyo

as Father Yang [Priest]

Pemeran Pembantu

Kim Tae Woo

as An Tae Seong [Commissioner General of Police]

Pemeran Pembantu

Seo Young Hee

as Ryu I Su [Lawyer]

Pemeran Pembantu

Yoon Ga Yi

as Choi Ye Na [Nurse]

Pemeran Pembantu

Yoo Seung Mok

as Baek Ui Won [Legislator]

Pemeran Pembantu

Kim Sang Ji

as Kim Jae Yeon [So Jeong's niece]

Pemeran Pembantu

Tae Hang Ho

as Detective Bu

Pemeran Pembantu

Oh Eui Shik

as Kim Si Hyeon

Pemeran Pembantu

Lee Do Goon

as Do Gun [Detective]

Pemeran Pembantu

Shim So Young

as [Head nurse]

Pemeran Pembantu

Son Sook

as Lee Eun Yeong (Ep. 1)

Bintang Tamu

Choi Sol Hui

as [Jae Yeon’s homeroom teacher] (Ep. 1)

Bintang Tamu

Lee Sang Yoon

as Choi Kang Yun (Ep. 1-2)

Bintang Tamu

Oh Yeon Ah

as [Kang Yun’s wife] (Ep. 1-2)

Bintang Tamu

Lee Won Jung (이원정)

as Cho Su Yeong (Ep. 2)

Bintang Tamu

Hwang Hee Jung

as [Pharmacist] (Ep. 2)

Bintang Tamu

Park Young Bok

as [Motel owner] (Ep. 2)

Bintang Tamu

Moon Kyung Min

as [Real estate agent] (Ep. 2)

Bintang Tamu

Park Won Sang

as [Su Yeong’s father] (Ep. 2)

Bintang Tamu

Jung Kyung Soon

as Kwon Gyeong Mi (Ep. 6)

Bintang Tamu

Lee Yi Kyung (이이경)

as Geum Myeong Seop (Ep. 7-8)

Bintang Tamu

Kwak Sun Young (곽선영)

as Koo Hye Rim (Ep. 7-8)

Bintang Tamu

Kang Gi Doong

as Choi Geun Su [Ye Na's older brother] (Ep. 7-8)

Bintang Tamu

Choi Moon Hee

as Mi Na

Bintang Tamu

Heo Jung Do

as Park Min Seong

Bintang Tamu

Lee Dong Chan

as [Gwang Cheol’s subordinate]

Bintang Tamu

Kim Do Yeon

as [Nun]

Bintang Tamu

Kang Seo Ha

as [Doctor]

Bintang Tamu

Oh Dae Suk

as [Center director]

Bintang Tamu

Kim Young Ok

as Kim Seon Ju [Patient] (Ep. 12)

Bintang Tamu

Kim Yong Jun

as [Ye Na's father] (Ep. 8)

Bintang Tamu

Park Joon Woo

Sutradara

Lee Su A

Screenwriter