In a warm university campus, a literature professor, portrayed by a charming and cunning protagonist, faces a somewhat unexpected dilemma: on the day of his wedding anniversary, his wife surprises him with a book containing the memoirs of an old university mate, who apparently has a rather liberated view on romantic relationships and the role of men in society.
Things become complicated when his youthful lover, an attractive and carefree woman, reappears in his life, unleashing a series of entanglements and misunderstandings that will test his commitment. As the plot unfolds, the professor finds himself walking a tightrope between his married life, his attraction to his ex-girlfriend, and the pressure from his colleagues who expect him to behave in a "masculine" manner.
Surrounded by a group of friends with divided opinions on love and fidelity, our protagonist must navigate the ocean of temptations and social expectations. Amidst laughter, moments of tension, and reflections on what it means to be a man in the 1940s, he faces his best and worst decisions, culminating in a conclusion that will reveal his true character and desires. In the end, the question arises: what does it really mean to be faithful?