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Xiang Haiyang, an only child who lost both parents at a young age, lived with his grandmother and shared a deep bond with her. Due to a lack of security, he developed a near-pathological obsession with the regularity of time, often believing, "People must learn to control time," without realizing that he was actually allowing time to control him. One day, he received the shocking news that his grandmother had passed away, leaving him without a center in his life. His daily routine collapsed. While sorting through his grandmother's belongings, Haiyang discovered a deed for a small island and a close-up photo of his grandmother with an unknown man. He vaguely remembered that his grandmother had once mentioned her youthful love story on the island. Haiyang decided to head to the island, taking his friend Sky with him to unravel the mystery of his grandmother's past.