A lawyer with a ten-percent winning rate is caught up in a murder case and becomes the notorious and genius con artist, Big Mouse, overnight. In order to survive and protect his family, he tries to reveal the true colors of the privileged people involved in a huge conspiracy.

Lee Jong-suk

Park Changho

Yoona

Go Miho

Kim Ju-hun

Choi Doha

Kwak Dong-yeon

Jerry

Yang Kyung-won

Gong Jihoon

Ok Ja-yeon

Hyeon Joohee

Oh Eui-sik

Kim Soontae

Kim Jeong-hyeon

Jung Chaebong

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