Description：Yuan Ningjing (played by Song Jia) is a psychologist. She once had a younger sister named Yuan Ningying (played by Ngan Cho Ling). Unfortunately, Yuan Ningying was kidnapped by kidnappers and her whereabouts are unknown. This huge blow caused the Yuan family to collapse. Twelve years later, one day, Yuan Ningying, who had grown up, returned to the Yuan family unscathed. While she was happy and fortunate, Yuan Ningjing faintly felt that something was wrong. Sure enough, although the returning Yuan Ningying seemed harmless on the surface, her heart was already corrupt. She had only one purpose for returning this time, which was to take revenge on the Yuan family. The sensitive Yuan Ningjing saw through everything, but could not find a person she could trust. Only her boyfriend Deng Sir (played by Lam Ka Tung) stood on her side. The two immediately launched a careful investigation into Yuan Ningying's disappearance for the past twelve years.