This is the story of a lawyer who has to pretend to be a school teacher in order to investigate a crime. At the center of the events is an unscrupulous lawyer named Ki Mu-hek. He has won almost all of his cases in his practice. Money has always played the leading role in his life. The life of the main character changes when he encounters a case of a schoolgirl's murder. In order to unravel this complex case, Mu-hek goes to the educational institution, posing as a teacher...