One rainy day, a car mechanic Cheol (Shin Seong-il) coincidentally meets Young-hee (Moon Hee) who is a housemaid at the French ambassador's house. Cheol was a man with great passion for success and introduces himself as the son of a rich businessman and acts as if the luxury sedan belongs to him. Attracted to Cheol, Young-hee introduces herself as the daughter of the French ambassador. They make a promise to date only on rainy days when Young-hee could wear an expensive French raincoat and hide her true identity. However, as the romantic dates on rainy days continue, they fall more deeply in love. At the same time, Young-hee is conscious-stricken by her lies. Finally, she decides to confess everything to Cheol. However, Cheol could not hide his anger and disappointment as his passion and expectation for social success and advancement crumbles into dust. In the end, he decides to leave Young-hee.