Once More, for Love(1971)

Original title: 미워도 다시 한 번 대완결편

Hye-yeong, now a financial success, returns from Germany to visit Shin-ho and his wife. She finds them in anguish over their son, Yeong-gyu, who was crippled in a recent fall. Hye-yeong pleads with the stubborn parents to allow her to take the boy to Germany for surgery.