Nam Sang-mi plays widowed police officer Lee Sun-ae who finds herself suddenly immersed into international espionage by Han Yoo-il (Dennis Oh), an undercover agent. Lee Joo-hyun plays Kang-Jun, who's recently transferred to the Criminal Investigation Department. He opens an old case involving Sun-ae's past that leads him to an entanglement between the current political/economic powers and their secrets. One of them, oddly enough, being Han Yoo-il. Who is this man? Why is he here?


Cast
Public Safety Station
    * Nam Sang Mi is Lee Soon Ae (Officer)
    * Jung Jong Joon as Sgt. Hong Kyung Jang

Police Station
    * Lee Joo Hyun is Kang Joon (new captain)
    * Yoo Sun is Park Eun Joo (Officer)
    * Kim Ha Kyoon as Lt. Jo Jung Hae
    * Kim Bo Sung is Detective Shim
    * Ahn Yeon Hong is Officer Oh Na Ra
    * Yoon Joo Sang as the commanding officer

Joong Ang Gymnasium
    * Choi Bool Am is Choi Bum Koo
    * Lee Ki Yeol as Wang Sa Bal (Big Bowl)
    * Kim Joon Ho as Kaori (Stingray)

Other people
    * Dennis Oh is Han Yoo Il (investor)
    * Ki Joo Bong as Yoo Il's assistant
    * Sung Eun as Choi Ji Soo (actress)
    * Kim Il Woo as Song Hyun Chul (Jang's Uncle, investor)
    * Kim Yong Hee as Park Sil Jang (politician)
    * Kim Min Jong