This is a romance-horror film set in the year of 1930s where two lovers were supposed to meet in the busy street of Shanghai. Shen Junchu, a cinematographer that's deeply in love with his girlfriend Xu Manli. Due to his extremely introverted character, Junchu was unable to confess to her how deeply he cared for her. Until the day that they are supposed to meet, Manli died in a car accident. Disheartened by the loss, Junchun plummets further into depression when he is forced by his controlling mother into a marriage of convenience to Sansan. Rejected emotionally and even at Juchun's bed, Sansan discovers a mysterious attic room, she's forbidden to enter by Junchu. She eventually enters the room, only to find the ghost of Manli who was wearing red dress. Manli offers to help Sansan's unhappy relationship with Junchu. When things are getting better, things changed suddenly, Chinese superstition dictates never to trust a woman in red.