The Crown Princess's Handbook of Being Cherished

[A sweet, soft, and adorable little ray of sunshine with natural Herculean strength x a sickly, sharp-tongued crown prince who dotes on his wife endlessly]

The Crown Prince of Dasheng has a reputation as a lazy opportunist. He's sickly, has a sharp tongue, and even the dogs in the capital wouldn't marry him as their Crown Princess.

An imperial edict arrives, giving the position of Crown Princess to the youngest daughter of a fifth-rank official from the countryside.

A good-for-nothing matched with a lazy opportunist. Everyone laughs: a perfect match.

Until they discover that the Crown Princess is beautiful, adorable, kind, and clever.

Everyone laments: A lovely flower planted in a pile of manure. How pitiful.

Then they discover that the Crown Prince can relieve disasters, quell rebellions, and govern the realm. He'd been hiding his talents all along.

Everyone is at a loss for words. "Uh... Your Highness, perhaps you could consider our children? They could be your consorts too."

Crown Prince: "I'll have to politely decline, thank you."

He has the best Crown Princess in the world.

P.S. The main story is told from the heroine's perspective. She won't suffer, and it's sweet, sweet, sweet, with plenty of pampering.