The genius cute baby holds the red thread: the autistic little prince fell in love with the heroine at first sight, personally "interviewed" and selected the mother, and was the first contributor to the plot.
Best friend turns into sister-in-law and assists: The hero's sister turns out to be the heroine's best friend. Together with the inside and outside, she can be called "the strongest assist team on the planet."
It starts with a contract and ends with sincerity: it starts with a deal where each gets what he needs, but ends with a true love that goes both ways and is blessed by the whole family.
