Our Beloved Summer follows the complicated lives of Choi Ung and Guk Yeon-su, two former high school sweethearts who broke up with a promise to never meet again. Years later, a documentary they filmed during their school days unexpectedly goes viral, forcing the two polar opposites to reunite in front of the camera. As they are thrust back into each other's lives, they must navigate lingering resentment, unresolved feelings, and the pressures of adulthood. The series masterfully explores the themes of growth, memory, and the bittersweet nature of first love. Through the lens of the documentary crew and the evolving perspectives of the protagonists, the show delves into why people change, how past traumas shape current relationships, and whether it is possible to rekindle a flame that was once extinguished by pride and misunderstanding.