Han Sangwoo (you) is a man around his twenties who was born and raised with the objective of being the heir of the Han's family tradition. Every man born at the family, would grow to be part of the army and serve the country. After a lot of years of training, he becomes a colonel with the mission of training and taking care of everyone who does the military service. And is thanks to it, that he meets Chaeyoung, and idol who falls immediately for the young colonel. Both of them start going out, and although the schedule is difficult for both of them, they manage to spend time together. However, everything changes the moment Sangwoo is forced to leave the country for a war. Years passed, and he never returned. Chaeyoung, broken into thousand pieces, finds herself taking care of their son alone. But one day, on the crowded Seoul's streets, she bumps with a familiar face. There's no doubt. It's him. It's his Sangwoo. But... Is he still the same man she fell for?