One Piece: God of Space - Chapter 381 Save a country?

Mortimer Zhu is an extremely unfortunate high school student who accidentally enrolls into an academy of a dubious nature, where it is the norm to jump in front of moving trains, get dismembered during orientation, and crushed by vindictive bouncing classrooms. Can he stay alive or will he die from the rigors of school? Why have evil spirits suddenly acquired a taste for his flesh?

- Description from Novelupdates

Cultivation destroyed, eyes poisoned blind and robbed of her status in the household?Luo Qingtong narrows her eyes and sneers, “Bring it on! Let me teach you a lesson!”A 24th Century Supreme Vision Master transmigrates to become the incapacitated genius daughter of the Marquis Household in a lower-class country.With a pair of powerful blood-red eyes armed with the ability to appraise treasures, see through things, heal, poison and break through defenses... She is invincible!A spirit and martial arts cultivator, an expert in weapons and medicine, a master in controlling beasts and deploying formations...She is the embodiment of the ultimate supremacy and unrivaled arrogance!Never does she expect to get involved with a person who is even more wicked than her. From then on, it becomes a game of I-run-you-catch. When you kill someone, I’ll hand you the knife.Together, let’s wreak havoc in the world!

On the Great Land of China, forces clashed for the sake of supremacy and Bloodline Warriors ran amok; the conflict of the strong threatened to shatter heaven and earth. A young man named Lu Li—nothing more than a humble Coffin Carrier from the Northern Desert—came along with Lu Ling, his sister. The two were regarded as puny insects and bullied, but little did people know that Lu Li had the strongest Bloodline of them all in him.

The male lead is devoted, the female lead is passionate, childhood sweethearts, everyday family matters, the ordinary daily life of nurturing a wife.