Dai Shimiao (played by Ke Jiayan) is an exchange student from Japan who came to Taiwan to study. She was infected by the enthusiastic and lively Xiao Ai (played by Zhang Rongrong) and became friends. Miaomiao was looking for the cake shop where she first fell in love for her grandmother, but found that it had become a second-hand CD shop. The owner of the CD shop was a young man who always wore headphones and did not communicate with others. Miaomiao was attracted to him unconsciously, and the carefree Xiao Ai used all her tricks to help Miaomiao ask his name and mobile phone number. The man named Chen Fei (played by Fan Zhiwei) was a mystery in the past. Miaomiao was determined to step into his world, and Xiao Ai suddenly felt lost. When Chen Fei's story surfaced, both girls experienced the pain of a broken heart. Loving someone but unable to say it out, the indescribable mood left traces in adolescence. When Xiao Ai's 18th birthday came, everyone went to the beach to celebrate. Although the heart was so painful, there was still a lot to look forward to in the future.