Nicknamed the "school for future criminals," Yuseong Technical High School isn't exactly the ideal place to study. A rarity among his peers, Ga-min is a student with just one goal: to get into university. At a school where it's every man for himself, he is rejected from countless study groups before he decides to form his own. Will he be able to defeat the odds and achieve his dreams?
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.
Disguised under the shadows of a mask, a crew of desperados band together under the leadership of a criminal mastermind known only as “The Professor” to pull off the biggest heist Korea has ever seen.