Bi Zhengming (Wang Anyu), who aspired to be a policeman since childhood, was accidentally disabled on the first day of reporting and became a "one-day criminal policeman". Eager to prove himself, he bravely broke into the thieves gang with a dark tide, but even if the boy was full of energy, he still missed the opportunity because of his recklessness. Bi Zhengming reflected on his mistakes and continued to practice under the guidance of the deputy captain of the criminal police, Da Zhou. The police planned to wipe out the gang at the thieves' meeting. Can the passionate boy keep his original intention and prove his innocence? When the dust dissipates, the rivers and lakes gradually emerge. Which is the best "proof" for the boy, the mist of friendship or the gentle heart?