Seo Hee Soo, a former top actress and the second daughter-in-law of the chaebol group Hyowon. As she puts in all sorts of effort after entering the new and covert world of chaebol families, Seo Hee Soo manages to keep her presence and true colors with confidence in everything she does.
Hyowon group’s first daughter-in-law Jung Seo Hyun, who is a chaebol down to her bones. Born from a traditional and powerfully wealthy family, Jung Seo Hyun was born with elegance, dignity, and intelligence. She is also rational to the point that she can maintain a cold expression no matter the situation.
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).
