A military vehicle stopped at Waterloo Bridge, and British Colonel Roy Cronin got off it. He took out an auspicious symbol carved in ivory from his pocket and stared at the railing alone. A love affair 20 years ago is just around the corner ... 19 17, during World War I in the United States, London. The air raid alarm sounded and people in the street ran to the bomb shelter in panic. A group of young girls are flying on Waterloo Bridge. Suddenly, one of the bags was knocked off and something spilled all over the floor. She stopped to pick it up and was about to be hit by a speeding carriage. Roy Cronin, a young captain officer, also ran to Waterloo Bridge. He helped the girl in time and escaped from the carriage. Roy picked up things scattered on the ground for the girl, including ivory auspicious symbols, which are the girl's treasure. The girl couldn't find a companion, so Roy took the girl's hand and ran into the crowded subway. Roy started talking to the girl in the noisy crowd. The girl's name is Mara and she is a ballet dancer. Mara hit it off with this charming young officer and talked to him about her favorite dance. Roy told the girl that he came to England for his holiday. His holiday is over, and tomorrow he will go to the front in France. When the alarm went off, Roy called a car for Mara to perform in the theater and attend a party that the boss couldn't refuse. Before leaving, Mara gave Roy her beloved auspicious symbol: "May it bring you good luck." Roy has fallen in love with this dignified, beautiful and naive girl and watched Mara leave. If he loses something, Roy finally didn't go to the boss's party, but hurried to see Myra's Swan Lake. After the break, he handed a note backstage and invited Mara to dinner. This note was confiscated by Mrs. Delva, the theater manager, who severely reprimanded Mara. Mara took the manager to the candlelight club. In the hall, Roy poured out his love to Mara, and they danced the waltz of Bon voyage. With the performance of each sound, the candles went out one by one, the music ended and the hall was immersed in darkness. Roy and Mara looked at each other affectionately and hugged and kissed for a long time. The next morning, it was raining outside the window. Mara looked out of the window in the dormitory and thought about Roy in the English Channel. Suddenly, she accidentally found Roy in the rain. It turned out that Roy's troops were delayed for two days because there were mines at sea. Roy proposed to Mara, and Mara readily agreed. The marriage of an officer of the Lanchester Legion born into a noble family needs the approval of the Duke. Roy bought Mara a wedding ring and rushed to the Duke's residence. Although Mara was born a commoner, the cheerful duke agreed to Roy's application. Roy took Mara to go through other necessary formalities and then rushed to the church. However, they came late. According to the law, no wedding can be held after 3 pm. Roy made an appointment with the priest to be back at eleven o'clock tomorrow. In the evening, Roy was recalled to the military camp, and Mara, who was about to become the bride, was immersed in sudden happiness. Just as she was about to go to the theater with her best friend, she received a phone call from Roy: the troops should leave early and leave in 20 minutes. Mara was anxious to get to Waterloo Station, and the train had already left. Mara insisted on seeing Roy off at the station, which delayed the performance that night. Mrs Delva was very angry. She can't stand the actors having a world outside ballet, and she wants to fire Mara. Her good friend Katie suffered the same fate because she stood up for her. They lost their jobs, moved to a cheap apartment together and lived alone. Careful Roy wrote to ask his mother to see Mara in order to take care of Mara. But while Mara was waiting for her mother in the restaurant, she accidentally saw Roy's name on the death list. At this moment, Roy's mother came to see her. Although the lady is very amiable, Mara is in a state of emotional confusion, rude words and unintelligible ... desperate Mara can't bear this huge blow and can't afford to get sick. Katie was forced to become a prostitute to pay for living expenses and Mara's medical expenses. Mara, who recovered from a serious illness, found this flaw, and she was extremely grateful to Katie for her friendship. Roy is dead, and the world means nothing to her. She can't let Katie take care of two people's lives alone. After recovery, in order to make a living, Mara also became a street call girl. Waterloo station. Mara, who has become a prostitute, wears heavy makeup and her eyes shine, attracting passing officers and soldiers. No one paid attention to her, and people ran around on the road looking for relatives who came to meet her. Suddenly, she froze: a familiar figure came towards him. It's Roy. He's not dead. He's back! Roy was very excited when he saw Mara, and Mara was in tears with mixed feelings. In a restaurant, Roy excitedly told Mara about his narrow escape: he was injured, lost his papers, was a German prisoner of war, almost died, but finally escaped. Mara listened quietly ... when Roy asked about her life, Mara was speechless and just repeatedly said, "If only I knew you were still alive." Roy, who has experienced Where Are You Going, doesn't want to leave Mara again. He immediately called his mother and told her that he was taking Mara home to get married. Mara turned Roy down painfully. Roy was sure that Mara didn't move on and couldn't say anything, so he took her to her hometown. On the way, Mara snuggled up to Roy, enjoying the rural scenery in Scotland and listening to Roy introduce her home and future plans. A beautiful wish rose in her heart. Roy's trust and love brought her a glimmer of hope. She knows that her heart is pure and clean, and she wants to wait for the plane to explain everything and start her life again. Cronin's home in Scotland. Mrs Cronin greeted them happily. In the evening, the ballroom is brightly lit, and Mara's elegant dance is the most striking. The ladies at the table were whispering, complaining that the Cronin family had married a dancer. The duke also came to the dance, and he kindly invited Mara to dance. During the conversation, he praised Mara's kindness and loyalty, and told Mara that the Cronin family always attached importance to family status, and Mara was an exception. Mara, who had just calmed down, fell into a state of anxiety again. Late at night, Mara wandered uneasily in the bedroom. Mrs cronin knocked at the door and came in. When she met in London, she asked Mara to forgive her misunderstanding and expressed satisfaction with her son's marriage. She praised Mara as a perfect person. After the lady left, Mara realized that the past experience would not be forgiven by the upper class, and she didn't want to keep this illusion. Mara ran to the lady's bedroom and told the truth in tears, saying that she would leave Roy forever. The lady didn't keep her and promised not to tell Roy the truth. Coming out of the ladies' room, Mara met Roy, who was so happy that he couldn't sleep. Roy didn't notice Mara's abnormality. He lovingly returned the amulet to Mara for safekeeping. Mara said goodbye to Roy sadly. Mara left a farewell letter thanking him for his love, and then left Cronin's home. Roy chased London and found Katie, who explained everything to him. Roy said sadly, "I want to find her forever." They looked everywhere possible, but they couldn't find Mara. At this time, Mara was on the Waterloo Bridge. A group of military trucks rumbled by, and Mara walked fearlessly to the speeding military vehicles. Her pale face looked beautiful and holy under the illumination of the headlights. Amid the screams of the crowd and the brakes of the truck, Mara ended her life, and her handbag and an ivory auspicious symbol were scattered on the ground.