Inspector Tai On-na has been happily carrying out her admin duties in managing files. Fate has brought On-na, seasoned armed lady cop Chan Sam-yuen and SDU Prince Mung Hon-sam together. After some case is solved by the trio, On-na’s boss Wai Chin-chiu assigns On-na to Cold Case Special Investigation Unit. Under Hon-sam’s command, On-na and a contingent of police officers with “special characteris...