The story takes place in the last years of the Qing Dynasty, when the great detective Sherlock Holmes (played by Fan Eilly) and his assistant Watson (played by Xu Zhongquan) came to China to play together and stayed at the Xianlai Inn.
During the Mid-Autumn Festival, graduate student Hu Yang reconnects with his former classmate Nan Xiaoyan in their seaside hometown. Their growing relationship faces unexpected challenges that test their love and resilience.
