Lee Hyoung-hun

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.

Weary from his wife's repeated suicide attempts, the husband seeks help from a secretive agent who an old doctor introduced to him. In the middle of the night, "they" come to his house.