When Kim Hee-woo was a high school student, his academic grades ranked at the bottom of his school. Through hard work, Kim Hee-woo entered a university and eventually passed the bar exam. He now works as an enthusiastic prosecutor. While he is investigates possible corruption related to a politician named Cho Tae-seob, he gets killed by an unidentified men. But, Kim Hee-woo wakes up and finds himself alive again.