"If life is irreversible, I am willing to use my last bit of courage to exchange for all my memories of you." The film tells the story of Mr. Zheng, who suffers from Alzheimer's disease. In order to ease his gradual forgetfulness of his deceased wife, Mr. Zheng decides to embark on the island tour that he missed most in his youth before all his memories disappear. On the way, Mr. Zheng met a young girl. The similar mood and the intersection of the journey made the two of them start to travel together by chance...