That night, two young astrology enthusiasts, Moon and Sun, met under the starry night by the seaside. When their affection for each other grows, Sun is admitted into a boarding school and has to move to another country as per his father’s plan. Like the sun and the moon, the couple hardly saw each other despite living in the same city, but their love endured even though they were separated and Moon’s mother was against their relationship. After overcoming the challenges from teachers, friends, and family, the time comes for Sun to leave.