Asian Drama

The story takes place after Lin Dong and Zhou Tong have joined hands to defeat the enemy. Evil lingers as Yi Mo Huang survives and the search for the two remaining talismans continue. After witnessing Ying Huan Huan sacrifice her love for him in order to assume her position as the Ice Master, Lin Dong realizes that he must take up his duty as the successor of the Zu talisman. He helps his younger sister Qing Tan become the Master of Darkness and heads to the Demon Realm to obtain the Life and Death Talisman. A final battle awaits Lin Dong and his former friend Lin Lang Tian who has been overcome by his greed for power.

The story of the investigative team Number 5 specially organized to actively combat crime through stake outs, wiretapping, communications monitoring, and deep-cover infiltration. A secret police unit that bends the limits of the law in order to fight crime, the new department comes in addition to the existing departments for criminal investigations, special investigations, criminal affairs, and white collar crime.

The members are Cha Gun-Woo, Jang Moo-Won, Jang Min-Joo and Choi Tae-Pyeong. They will hunt down criminals and investigate crimes while undercover (hence the title).