People always find it hard to resist the sad mood of "Gloomy Sunday". It turns out that this song is related to a complex and sad love story. In a restaurant in Budapest, the capital of Hungary in the 1930s, the beautiful Ilona (Erika Marozsán) was deeply loved by two men at the same time. One was the restaurant owner and the other was a pianist. None of the three were willing to change the status quo and break the balance. Ilona felt calm and happy with the love of two men at the same time. The pianist composed "Gloomy Sunday" for her, and he and the restaurant became famous. However, the appearance of Hans completely destroyed everything. He was once an unknown boy, and while he was deeply fascinated by "Gloomy Sunday", he became Ilona's servant. Hans proposed to Ilona, but was rejected. He is now an officer with a lot of hatred and is now in a prosperous position. He is coming to Ilona with his long-planned revenge plan, giving them a fatal blow in their lives. The story of love, revenge and war is entangled in Budapest.