A lawyer, caught up in a murder case, becomes a notorious and genius con artist overnight, in order to fight against a huge conspiracy and survive.

Twin brothers Woo-sin and Soo-hyun lose their father in a murder case. Twenty-two years later, the brothers seek to clear their father's name.

M, a mystery writer, has a girlfriend of five years named F, who disappeared on Halloween night. When a woman comes and claims to be her sister, M begins the search for his girlfriend. Along the way, the people he meets describe a woman very unlike the F he knew.