Su Mo, who was in college, suddenly received a call from his girlfriend's mother. He learned that his girlfriend was sick and rushed to take care of her. But his girlfriend left without saying goodbye after the operation, which made Su Mo fall into pain. A few years later, Su Mo took the national examination and was assigned to work in the police station. Later, he became an undercover agent due to organizational arrangements. And met his girlfriend again by chance. Then a thrilling story unfolds
