A Sparrow Nests in a Parasol Tree, and I Picked Up a Husband

"Sis, I think I've figured out why I'm getting bigger. I'm only gaining weight around my belly."

"Could it be that I'm pregnant?"

?

"My ex-husband died. This is his posthumous child."

Someone returned, aggrieved: "I heard you've been telling everyone I'm dead."

The male and female leads are both devoted to each other. No love rivals, no wicked female supporting characters.