This drama revolves around Choi Ung and Kook Yeon Soo. A documentary to find out the difference between a top student and worst student in school brings them together. They fell in love and broke up.10 years later, they are forced to face the camera together again by their producer friend. This series depicts their complicated feelings to meet again as ex-lovers and growth as a person and in relationships, and how they confront their past and become a better individual and together in relationship with each other once again.