Yvonne, a brilliant andrology doctor, unknowingly conceived a son, Allen, after a one-night stand with Joe Guest to inherit her sect’s medical secrets. That night, Joe developed a mysterious allergy to all women—except Yvonne. Five years later, fate reunites them when Yvonne saves Joe’s supposedly deceased grandmother, who then forces them into marriage. Neither realizes their past connection—until their wedding night, when the truth is revealed: Joe is Allen’s biological father, and their flash marriage was destiny all along.