This drama is about the lives of Tae-hee and Yun-hee, two sisters whose mother died while giving birth to Yun-hee. Their father, who loves them dearly, married their mother without their paternal grandfather's consent, and deprived of any familial support, the sisters and their father struggle to make ends meet even as their father faces a life-threatening illness. This drama follows Tae-hee and Yun-hee into adulthood as, separated by a cruel twist of fate, the girls come to lead very different lives, oblivious of one another.