In the play "A Sunny Morning," Dona Laura and Don Gonzalo meet in a park in Madrid. Dona Laura is a white-haired old lady who is refined and has a sharp mind, while Don Gonzalo is an old gentleman who is gouty and impatient. Both of them are initially hostile towards each other, with Dona Laura scolding Don Gonzalo for scaring away the birds she was feeding and Don Gonzalo being rude to her.

As they continue to talk, they begin to recognize each other as their former lovers, Laura Llorente and a gallant lover. Despite this realization, they continue to spin fictitious stories about themselves and do not reveal their true identities.

Throughout the conversation, the two of them display a mix of humour and irony. They tease each other and playfully argue, but also show glimpses of the deep feelings they still have for each other. Eventually, they agree to meet again at the park and a new friendship begins.