Reborn as the Princess' Knight (GL) - Chapter 219 78:

The young master of the Huo Family was well-known in the Rong City. Having been brought up in a military, political, and business family, he was decisive in dealing with businesses, yet sexually continent as it was said. Nevertheless, he happened to fall in love with an illegitimate daughter.

The disgraceful illegitimate daughter had been detested by her whole family, but suddenly won the love of the young master of the Huo Family.

Since then, he turned into a “slave” of his wife and pampered her.

Mrs. Huo: “They say I am an illegitimate daughter, and totally out of your league.”

Master Huo: “Who has such a big mouth! I’m gonna sew it up!”

Mrs. Huo started circling on his chest with a finger, “They also say you’ll get tired of me sooner or later.”

Master Huo held his wife into his arms, proving his love to her with practical actions, “Nonsense! My wife’s body is soft and easy to be pushed down to bed, how come I will get tired of you!?”

Mrs. Huo: “Pervert!”

- Description from Novelupdates

Xue Xi is forced to fall in love at first sight with this dangerous man on their first meeting. With death being the only other option, she makes the first move:

The empire has turned into the land of the undead due to a spell gone wrong. God summoned heroes from countless worlds to purify the empire and plant new hope. Lee Shin Woo, an ordinary earthling, was also summoned. As an undead, that is.

A side story series featuring the girls of Kyoukai Senjou no Horizon.