Insider
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Season 1
16 Episodes
Episode 1
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Episode 1
Episode 2
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Episode 2
Episode 3
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Episode 3
Episode 4
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Episode 4
Episode 5
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Episode 5
Episode 6
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Episode 6
Episode 7
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Episode 7
Episode 8
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Episode 8
Episode 9
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Episode 9
Episode 10
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Episode 10
Episode 11
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Episode 11
Episode 12
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Episode 12
Episode 13
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Episode 13
Episode 14
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Episode 14
Episode 15
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Episode 15
Episode 16
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Episode 16
Insider
Overview
When a judicial apprentice goes behind bars while on an undercover job, he plays the hand he’s dealt to survive prison and get his payback.
gambling
prisoner
revenge
suspense
Last Updated: July 7, 2025
Cast
![Lee Dong-won as [Seongju Prison inmate #1321]](https://image.tmdb.org/t/p/w276_and_h350_face/elFGiCQHgntIBcBq5l0nW4wd9wy.jpg)
![Moon Sung-keun as Do Won Bong [Seongju Prison inmate]](https://image.tmdb.org/t/p/w276_and_h350_face/wQjOvAFqCItwMw7dxa486KnGgEE.jpg)
![Heo Dong-won as Yang Jun ['Skin Nation' chairman]](https://image.tmdb.org/t/p/w276_and_h350_face/2ozJdoP76fZvlLo1MhqPunoy6CW.jpg)
![Choi Dae-hoon as No Seung Hwan / Nam Dae Moon [Seongju Prison inmate]](https://image.tmdb.org/t/p/w276_and_h350_face/crBiA541zurCqSrSjpS4Q6BWglX.jpg)
![Han Jae-yeong as Jo Hae Do [Bukyeongpa gang]](https://image.tmdb.org/t/p/w276_and_h350_face/pPro8M6ypFNNK75ClKsSecOkBiC.jpg)
![Oh Tae-kyung as Woo Sang Ki [Goldman Casino's accountant / Min Ho's father]](https://image.tmdb.org/t/p/w276_and_h350_face/xde1lSXPGhqEHL8DzLIn3YtuLhb.jpg)
![Choi Moo-seong as Song Doo Cheol [Bukyeongpa gang]](https://image.tmdb.org/t/p/w276_and_h350_face/pcbn8YaW0iOR5jpV0aC7jwzDtAj.jpg)
![Han Kyu-won as Eom Ik Soo [Bukyeongpa gang]](https://image.tmdb.org/t/p/w276_and_h350_face/86QTcqMSH75zqh6T6jL4F0uXAlQ.jpg)
![Jo Hee-bong as Ryu Tae Hoon [Seongju Prison inmate]](https://image.tmdb.org/t/p/w276_and_h350_face/3Fj9bijDL3A93o7XLM1sGYRcAIf.jpg)
![Lee Ha-yul as Kim Woo Jae [Prosecutor]](https://image.tmdb.org/t/p/w276_and_h350_face/qnCUwe8tv6xaHNxrmAuDcTDtc4m.jpg)
![Kim Min-seung as Woo Min Ho [Sang Ki's son]](https://image.tmdb.org/t/p/w276_and_h350_face/6xtI6z0qZs4Ysp7JPiCyZncuBFw.jpg)
![Yoo Ha-bok as Kim Jung Gyu [Prosecutor]](https://image.tmdb.org/t/p/w276_and_h350_face/bDlnrcOUiCFqhRQDYt1qO4IpEp0.jpg)
![Kim Byung-cheol as [Sinseondong elder]](https://image.tmdb.org/t/p/w276_and_h350_face/xrJBDV1RS4IspGMXU5BJ6q9vYPp.jpg)
![Seo Myung-chan as [Sinseondong elder]](https://image.tmdb.org/t/p/w276_and_h350_face/33EsIbW5PQcm81LldaDQs4MB10g.jpg)
![Lee Yang-hee as [Sinseondong elder]](https://image.tmdb.org/t/p/w276_and_h350_face/dLYb25levMlUyGEVahSOQI0NM73.jpg)
![Moon Jong-won as Kim Sung Bum [Seongju Prison staff]](https://image.tmdb.org/t/p/w276_and_h350_face/2bd13BVhTJn5SmBmV3wXuxWIO6N.jpg)
![Park Joong-geun as Park [Seongju Prison guard]](https://image.tmdb.org/t/p/w276_and_h350_face/xA3x7TIrWeLNXqmr8shXhaqdyFb.jpg)
![Kim Kyu-baek as [Seongju Prison inmate #1369]](https://image.tmdb.org/t/p/w276_and_h350_face/lx16EMlOb2XNRZHLDMpWVLjplfY.jpg)
![Hwang Dae-woong as [Seongju Prison inmate #8934]](https://image.tmdb.org/t/p/w276_and_h350_face/rn0f6zs7G5mpL5Sn08i2TnjoqrL.jpg)
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