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Lee Young-Joon's family runs a large company and he works as the vice-president of the company. He is smart, rich and handsome, but he is arrogant. His secretary is Kim Mi-So. She has worked for him for years and she is perfect for him, but Kim Mi-So decides to quit her job.
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.
Detectives from the present and a detective from the past communicate via walkie-talkie to solve a long-time unsolved case.
A top Korean actor is forced into virtual reality and tasked with 'protecting his child by playing a father', only to discover a shocking truth as he begins to love his son with a real father's heart.
