Synopsis : Kim Yo Han (Kang Ha Neul) works as a judicial apprentice. He is deliberate in his actions and holds a poker face. Kim Yo Han conducts an insider investigation. He becomes involved in an unexpected case. This leads to Kim Yo Han becoming a prisoner. He struggles to hold a card to change his fate in prison. Main Cast : Kang Ha Neul as Kim Yo Han , Lee Yoo Young as Oh Soo Yeon , Cha Yub as Kim Gil Sang , Sung Ji Roo as prison Governor , Jung Man Sik as Yang Hwa , Heo Sung Tae as Yoon Byung WookThis leads to Kim Yo Han becoming a prisoner. He struggles to hold a card to change his fate in prison. Main Cast : Kang Ha Neul as Kim Yo Han , Lee Yoo Young as Oh Soo Yeon , Cha Yub as Kim Gil Sang , Sung Ji Roo as prison Governor , Jung Man Sik as Yang Hwa , Heo Sung Tae as Yoon Byung Wook