Chinese secret agent Da-hee receives intel that a large number of illegal firearms are being smuggled into Korea and is sent to investigate the case. She meets Su-han, who is supposed to help her with the case, but due to his lackluster skills they fight over trivial things. But as their witnesses are suddenly murdered, the two of them quickly become the prime suspects.
Kim Young-kwang
Woo Soo-han
Lee Sun-bin
Yoo Da-hee
Oh Dae-hwan
Jeon Hoon
Seo Hyun-chul
Chief Detective
Choi Byung-mo
Cha-oh
Kim Tae-hun
Shin Gi-roo
Julien Kang
Yuri
Park Jin-su
Senior Detective
