Toaru Majutsu no Index: New Testament - Volume 9, Chapter 6: Shifting and Fluctuating World. Version_Omega.

Xiao Ze, who was dedicated to the people and vowed to become a generation of Ming Jun, accidentally fell on a little lady.
The little lady was born beautiful and lovable.
So Xiao Ze accepted his life and got the name of fear.

ps:
①The male protagonist has no concubine, and he is dedicated to serving the country.

- Description from novelbuddy

She was originally an assassin. After rebirth, she was reduced to another world’s Di family’s most inferior concubine-born daughter. With an extremely hideous appearance and no way to cultivate, she was the object of everyone’s humiliation and bullying.

Like most candidates, Zlatan's dream was a simple one. To pass the hunter's test, join a guild, hunt monsters and reach the A-class.Eventually, as he dreamed of, he achieved it hundreds of years later. Having sacrificed more than he could take in, using the most unthinkable and brutal measures, he became an S-class Hunter instead.Obtaining the Copper Flame back then after the Aura Awakening Ritual, that was his greatest flaw. Taking a span of 80 years to reach a D-class. Still, Zlatan Elmore became the most powerful hunter to exist.Falling on the battlefield against a Two-horned Dragon, he suddenly awoke as his 30 year old self. Given another chance at life, he didn't only have his memories but he's also given a Blank Scroll. This mysterious scroll doesn't only speak, its omniscient!

Young Master Lu says, “My wife knows nothing at all and has a bad temper. You'd better not bully her.” Gu Mang watches silently as this man warns everyone who comes his way.Young Master Lu says, “Read properly. How can you remember anything if you flip the pages so quickly?” Gu Mang takes up another book and reads it speedily.Young Master Lu complains, “What should I do when my babe hates studying?” What else can he do other than dote on her?Until one day...“Young Master, numerous universities in the capital and even top universities overseas are fighting to get Madam to enroll!”“Young Master, many TCM research centers are getting into deadly squabbles over hiring Madam.” “Young Master, a legion of huge international law firms want to employ Madam.”“Young Master, several eminent hacking organisations are here too...”“Young Master, multiple financial groups have come...”“Young Master...”To all these, Young Master Lu says, “What the f**k! Get out of here!”Yes, his wife is a genius.