Cho Jin-woong plays the role of criminal policeman Baek Joong-sik, who is ordered to protect the parolee Jin Guok-ho (played by Yoo Jae-myung) who is threatened by a 20 billion murder plan, and is therefore caught in the dilemma between the police on duty and the anger against criminals.Zhao Zhenxiong, who is well-known to the public through Officer Li Chaihan in "The Signal", has played a detective many times. This time he will bring a refreshing role to the audience. Zhao Zhenxiong said that Baek Zhongzhi is different from the ones he has played in the past.There are many differences in the characters. Humanity can be said to be a major feature of Bai Zhongzhi, which deserves the attention of the audience.