A story revolving around a car accident, coded letters and hidden secrets from the past. Su Yan may seem bright and cheery on the outside but inside is a young woman who is full of insecurities. Because she refuses to open up, she often gets into disagreements with her family and friends. Through the support and care of her boyfriend Lu Jinyu, Su Yan decides to write letters to her friends on the eve before her wedding to reveal her honest feelings and a truth about the past. The letters open up old memories, yet an accident comes at the most unexpected time...