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
• Yoona
• Kim Ju-hun
• Kwak Dong-yeon
• Yang Kyung-won
• Ok Ja-yeon
• Oh Eui-sik
• Kim Jeong-hyeon