Onnenpeli (1965)

Magazine editor Jussi and his girlfriend Leena, an airline stewardess, share an apartment with Jussi's sister Eeva. During a fashion shoot Jussi meets Telle, a professional model who has just returned to Helsinki after years in Paris. Looking for a place to stay, Telle gets Eeva's room while Eeva goes to Stockholm for a few days. Jussi and Telle start an affair while still working on fashion features for the magazine.