The full stop teacher named this TV series is like a fascinating spy war drama, and he is the one who makes the plot full of humor. Full stop, formerly known as Ju Zhaojie, with his unique acting skills, played the role of a primary school teacher to the fullest. Whenever he appears, the audience will look forward to his every roll call, because he can always bring out some interesting dialogues at the same time as the roll call. His career conversations with the parents of the students, and even the arrangement of seats for the students according to the parents' occupations, are hilarious.
Li Chunqiu (Zu Feng), the forensic doctor of the city bureau, hides an unknown secret behind his identity. He was once a spy of the military command, with a heavy mission, but he gradually forgot because of the dullness of life. However, when he gets into trouble and begins to escape the control of the Secret Service, he realizes that his mission has not disappeared.
Ding Zhan Guo (Hou Yong), a national ** lurking in the police station. On the surface, he is a capable backbone, doing his best to handle the case, staring at Li Chunqiu, trying to reveal his true identity. However, no one expected that this seemingly "strong and forbearant police officer" turned out to be the deepest lurking national spy and the instigator of the "Black Tiger Project".
Yao Lan (played by Mei Ting), she is the first long, life-saving, gentle and kind. At work, she is an angel in white;Back home, she was a good wife and mother. For her husband's colleague Ding Zhanguo's orphan daughter Ding Meixi, she treats her as her own and takes care of her meticulously.
Chen Liye (played by full stop), he is the teacher of the children of Li Chunqiu and Ding Zhanguo. In the beginning, his image was that of a greedy and obscene person, which was despised. However, in a hostage-taking incident, his true face gradually emerged, and he became the key guide for Li Chunqiu to abandon the secret and turn to the light.
Gao Yang (Ding Yongdai), he is the deputy director of the Harbin Municipal Bureau and an experienced veteran. He was calm and wise, had leadership skills, and played an indispensable role in a series of anti-special activities. He is a breath of fresh air in a world full of "masks".