High school is a tough but a happy phase in everyone's lives. We learn, love and we get hurt. But at the end of the day, we should face everything with a smile. Nothing is constant, everything changes, so does feelings. What if one day, the one that got away came back into your life when everything seems so perfect already?

     Lee Seoyun is a typical shy girl who does not have a lot of friends and is barely noticeable. Because of her father's work, their whole family moved to Seoul. She then started her journey in a new city and school. This is where she will experience her first heartbreak and first relationship.