In "Illegal Justice", Jin Zhiyong is a student of the police academy during the day and becomes a "dark hero" at night, aiming at cracking down on criminals who evade legal sanctions. The purpose of wearing a mask is to hide your true identity, protect yourself from being investigated by law, and at the same time facilitate your secret actions.
In the play, Jin Zhiyong's behavior caught the attention of the police, especially the police captain Zhao Xian. Zhao Xian was determined to bring Jin Zhiyong to justice, and later discovered Jin Zhiyong's true identity, hoping to bring Jin Zhiyong back to the right path.