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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 investigates possible corruption related to a politician named Jo Tae Sub, he gets killed by an unidentified man. However, Kim Hee Woo wakes up and finds himself alive again.
Kim Hee Woo came from an inauspicious start as a low-grade high schooler to work his way up through university and finally pass the bar examination. His relentless hard work has finally paid dividends, and he has become a public prosecutor. During the course of his investigations, he must conduct a probe into a politician suspected of corruption. But his investigation is abruptly ended when a mysterious man kills him.
However, he later comes to, finding that he is actually alive. Restored to the mortal realm, he finds that he must return to university and complete his academic journey again – while he tries to discover the truth about what happened to him.