When the sun sets over the horizon on the beach in Okinawa, a penniless middle-aged Taiwanese priest named Ching-wen cannot help but sketch a Japanese young woman named Shizuko, who is gazing at the ocean. He sends her the portrait afterwards. Yearning for a marriage based on romantic love, Shizuko refuses to marry into a rich family as her parents wish. Instead, she bravely falls in love with Ching-wen. However, there is one more obstacle in this May-December romance apart from the couple’s age difference, identities, parents, and others’ disagreement. It involves a long-lasting emotional trauma triggered by the forced repatriation of Japanese residents from Taiwan after World War II. At the beach, love comes and goes. Will this relationship with an age gap last forever?