The Sister-in-Law Affairs: My sister-in-law's raunchy hobby A lonely goose father (a man who sends money to his family abroad) takes special interest in his sister-in-law's hobby My sister-in-law's secret part-time job Seon-mi lives with her sister and works a secret part-time job in order to pay rent. One day her brother-in-law comes in as her guest... My sister-in-law's hidden past Gwang-wook is shocked to see his sister-in-law during his fifth year of marriage. She hasn't changed since he loved her five years ago.