Shanghai, 2003 Suddenly, Baichuan senses something is not right with his life - sometimes, he feels he can see his memories, so real yet so unfamiliar. This all seems to begin with an unexpected invitation from Baichuan's ex-girlfriend, Qiuyu, who has been away for many years. Twelve summer days, just like twelve lucid dreams... "The time seems to be working anomalously on you."