Singleton Casey is 40 years old. She is not married and has no fixed boyfriend, but she likes children and hopes to be a mother. Casey decided to perform artificial insemination. Although this decision was opposed by her best friend Wally, she still decided to find a sperm donor and insisted on getting pregnant. With the help of modern medicine, Casey quickly found a suitable donor-the handsome Ronald. After finding the source of the sperm, Casey decided to open a "conception party" for herself.
Although Wally has always been concerned about Casey and has always admired Casey, this somewhat neurotic man has missed the best moment to confess to Casey, and Casey now only regards him as his friend. Not a lover, not a marriage partner. After seeing the handsome Ronald at the "Conception Party", Wally felt very disappointed and drank a lot of wine. Depressed Wally, in the midst of a blunder, accidentally dumped the sperm donated by Ronald, and in desperation, he had to replace Ronald's sperm with his own sperm.
Seven years later, Casey returned to New York with her son Sebastian, who was a little nervous and precocious. Casey meets Wally and asks his children to call him Uncle Wally. Not only are Wally and Sabastien very similar in appearance, they are also very similar in their small movements and temperaments. Wally seemed to finally have a chance to confess to Casey this time, but the trouble is that Ronald also appeared in Casey's life again
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