Despite having an excellent memory, Ahn Dae Sung has yet to pass his civil service examination. Studying to become a ninth grade public official, Dae Sung has taken the exam three years in a row and failed every single time. Even so, his determination remains strong and with the never ending support of his mother, Myung Sook and his girlfriend, Ah Hee, Dae Sung is convinced that the next time he takes this exam, he won’t fail.Working part-time at the convenience store his mother owns on the outskirts of Seoul, Dae Sung’s life takes an unexpected turn when a murder takes place at an apartment building nearby. As a police officer, Ah Hee feels it’s her duty to solve this case and thus begins an investigation of the murder on her own. Despite not being an official detective, she soon makes a shocking discovery. Finding a receipt from Myung Sook’s store at the scene of the crime, Ah Hee pulls Dae Sung and his mother into the investigation. With no other clues to go on, Ah Hee, Dae Sung, and Myung Sook are determined to find a way to crack this case. But how can a team of rookies catch a murderer when the pros on the job have yet to find a single clue?
