Li Fan, who traveled through time and became a policeman, after binding the clue system, discovered his fiancée Zhang Xue's prostitution during a blind date and arrested him. Since then, he has repeatedly solved strange cases, captured A-level wanted criminal Wang Boda alive, destroyed a theft den, captured Lu Zeyang, the real culprit in the serial murder case, and subdued many wanted criminals and robbers. With his outstanding military exploits, he was promoted from trainee police officer to superintendent, becoming a righteous force guarding the port city.
