In 1992, a heavy rainstorm caused massive power outage in Hong Kong. At that night, two young astrology enthusiasts, Moon and Sun, met under the starry night by the seaside. When their affection to each other grew, Sun was admitted into a boarding school and would move to another country in a few months under his father's plan. Like the sun and moon, the couple could hardly see each other despite that they were living in the same city, but their love endured amidst the separation and opposition from Moon’s mother. Overcoming the challenges from teachers, friends and family, time has come for Sun to depart…

In 1992, on a small island in Hong Kong, a boy fell for Yan crazily searched for her by dozens of unbelievable means. Although every 'Yan' he met turned out to be someone else, they did bring life-changing influences to each other. 22 years later, when the story is finally unveiled, middle-aged Yan is deeply moved.