From happy enemies in junior high school to secret feelings in high school, from full of expectations to ruthless betrayal, why is he so changeable? Has their nine-year friendship really evaporated? When love is broken, who is the cruelest? She went abroad twice and met the domineering and innocent Oppa. What kind of sparks will fly? One is a person who has amazed time, and the other is a person who has passed the years tenderly. Will she reunite with her old love or hold hands with her new love? Can she have the courage to leave the wrong person, and can she have the courage to pursue the right person? Let's wait and see!