Kevin and Nara have been friends since childhood, although they love each other, they promise to always be Best Friends Forever. Kevin, who turns out to be more than a friend, never dared to confess his feelings to Nara. In fact, Kevin often accompanies Nara through difficult times when her romance fails. When Nara falls in love with the mysterious rock climbing boy Juned, Kevin feels that there is no hope for him to be with Nara forever. Humans can only plan, but God decides, can Kevin and Nara be put together? Or both of them choose their own path?