Xian will always remember the loneliest and bluest of summers when she was 15. After her mother has to go abroad for work, Xian is thrown into the care of her father, a free-spirited photographer, who she has barely seen since her parents divorce. He’s struggling financially and is fooling around with his assistant who has an 18-year-old daughter, Mingmei. Soon, Mingmei appears like a ray of shining light to Xian. During this restless summer, the conflict between the innocence and the impulses of youth will leave an indelible mark on Liu.