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

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