Fei Li is a 30-year-old IT specialist who has a secret crush on Zhao Ximan, a girl from the business department. One day, their company goes on a year-end trip to Finland. At the end of the trip, Ximan accidently falls off from the ski field. The next day when she wakes up in the hospital, a temporary amnesia causes a loss of her short term memory for one day. As for Li, this is an unexpected chance, he makes Ximan believe that they are in love. Before Ximan can recall all the memory, Li has one day to play the role of her boyfriend.