The Wild Goose on the Wing(1979)

After studying drama in the UK, Tan-feng returns to Taiwan to investigate her sister's death. She suspects that her sister committed suicide because her boyfriend, Huai, jilted her. Out of bitterness, Tan-feng begins to plot her revenge by seducing Huai and his childish brother. However, things don't go to plan as she falls crazily in love with the enemy.