

Soo In, Bok Nyeo, Pung Geum, and Mi Oh, are four female prisoners at a correctional facility who have been victims of a miscarriage of justice in different cases, which later turn out to have a common thread intertwined. They team up to challenge a big conglomerate in order to exact revenge. These four women forge a bond based on their common grievances and lean on each other for support. Though they are not related, they become a family of sisters.
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Lee Seung-joon
Park Won-Jae

Du-shim Ko
Shim Bok-nyeo

Kim Yun-Seo
Ma Joo-Hee

Hyun-Kyung Oh
Son Poong-geum

Sang-woo Do
Ma Do-jin

Jong-Won Lee
Tak Wol-han

In-hwan Park
Park Yi-moon

Geun-hyeong Park
Ma Tae-san

Hye-seon Jeong
Bok Dan-sim
Jeong-su Byeon
Ma Joo-Ran
Yeon-Soo Ha
Seo Mi-oh
Jung-kyun Kim
Lee Gang-choon
In-hwa Jeon
Cha Aeng-Ran

Ji-hye Han
Moon Soo-in

Ha Seok-jin
Nam Woo-seok

Jeong-hak Kim
Employee of public prosecutor's office
Jung Ji-soon
Tak Dae-han
Eun-Jin Ha
Cha Aeng-ran (young)