Yuan Yingcai, a teacher from an art school, falls to his death. His twin brother, Yuan Yingjie returns from France to settle his affairs and finds out that his sister-in-law Fang Aixin and Jiang Xiaolei, whom he was secretly in love with, are cousins. The police concludes that Yingcai’s death is a suicide. Meanwhile, Yingjie discovers Yingcai’s student Ethan had plans to kill Yingcai.