Donghae was a famous secret agent in his company. His name is known as Runshoo ecause he can run faster when he is on duty - chasing his enemy- and he also a good shooter- he can shoots his enemy right to the point he wants even from far away. He is his boss right hand. Until one day, when he was on duty to chase a mafia who took his lovely girlfriend. He was trying to solve a big real estate company from the mafia but he was too late to save his girlfriend's life. When he arrived in the place that his girlfriend was kidnapped by the mafia, his girlfriend already died He cant believe that his company didnt want to take a responsibility to his gf family. After sending his gf death body to her family, Eunhyuk- who is his bestfriend for 7years- get angry to him and break their friendship. Eunhyuk promised one day he would take a revenge. Eunhyuk which is known as special secret agent because his ability in making a strategic plus his skill in battle, is the most expensive agent. If he wants something he will make it happen and he will get it no matter how.. Donghae knows that Eunhyuk can kill him everytime he wants. So Donghae decide to quit from secret agent and move to another city. Donghae changes his name become Junghwa. He chooses Daegu for his place. There, he works as a lecturer in marketing strategic - same lesson with his school 3 years ago - in Keimyung University. He meets Yoona who is the most clever student in class. He fells in love for the first time because Yoona is the first girl who can make him smile aftet he lost his girlfriend. Even when he was sick , Yoona really took care of him. Beside her beauty, Donghae knows that Yoona has a beautiful charisma inside of her and that makes Donghae take an action to make Yoona becomes his girlfriend. Yoona and Junghwa become a real boyfriend girlfriend for almost a year until Eunhyuk comes to Daegu to meet her childhood friend, Yoona. Eunhyuk met Junghwa who is actually Donghae in Yoona's apartment. Both Eunhyuk and Junghwa knows that Eunhyuk already knows that Junghwa secret. Eunhyuk tries his best to reveal Junghwa secret to Yoona and separate them. Plus, Eunhyuk finally tell the truth to Yoona and Junghwa that Yoona's Dad be in jail now because of Junghwa which has real name Donghae, and actually who killed Donghae's past girlfriend is Yoona's dad which is the mafia that Donghae chased of. So what will Donghae and Yoona do next? Will Yoona forgive Donghae because He made her dad and her only family - be in jail until his entire life? Will Donghae loves Yoona again when he knows that Yoona's Dad is the one who killed his past girlfriend? And what will Eunhyuk do to Donghae who already took his love? First his lovely siblings- his sister who did because of Donghae, and now his first love for almost 12 years, Yoona? Hope you guys will love this kind of story! ^^