The Misfit of Demon King Academy (WN) - Chapter 4.2

A wonder falling down from heaven! A boy possessed by strange blood! Gods tremble! Demons flee! A boy from the land of Dong Zhou. A pink skull as his sworn friend until death. A story of a determined warrior struggling for power. A legend that shakes the galaxy and disturbs the worlds of god, demon and man.

- Description from Novelupdates

As childhood sweethearts, they were made to engage under the manipulations of their families. It involved having to to live in the same room and sleep together.

One night, she is accidentally made drunk, and in his delirium, he kisses her only to realize he enjoys it. From time to time, he would sneak a kiss on her, but his “crime” is eventually discovered in an accident. After being accused by her, he says with a smile, “You are my wife, why can’t I kiss you?”

The two people’s daily routine is full of bickering and mutual discrediting of each other.

Although he claims to disparage, he actually cares intensely about her. He feels crazily jealous when she is close to other men, to the point of tying her to his side, so that she becomes exclusively his.

- Description from web

This is the novel behind the TV series, “Love Like the Galaxy”.
The following synopsis is based on the TV Series.

“The young Cheng Shaoshang was left behind because her parents had gone off to fight in the war. In order to protect herself from her scheming aunt, she had to be extra diligent while pretending to be the opposite. However, years of estrangement have made it difficult for them to become family again.

Lacking love her whole life, Cheng Shaoshang is both pragmatic and insecure in choosing a partner for marriage. She encounters three men – the emperor’s adopted son Ling Buyi, the talented Yuan Shen of Bailu Mountain, and the aristocrat Lou Yao who each have their pros and cons. Although the road to love is bumpy, she never regrets every choice she makes. Through her interactions with Ling Buyi, she unintentionally becomes involved in the mystery surrounding his family and his identity. The two grow from their experiences and worked together, upholding the righteousness in their hearts to resolve a national crisis.”

- Description from Novelupdates

“In misfortune awaits fortune.”In a universe where Gods dwell on the highest floors of the Tower, an Arcana Card for immense good luck was created. To balance this, a devastating misfortune card was also born. Unbeknownst to the Gods, both cards slipped out of the Tower and went unnoticed.Julien, cursed by the card of immense bad luck, lived a life where death shadowed his every move, and the Grim Reaper’s blade seemed ever-present. His first life ended in despair, but at the height of his misfortune, a glimmer of hope emerged when a mysterious entity offered him a deal.The deal: conquer the Tower and fulfill her request, in exchange for a chance at a better life after reincarnation. With the Eternal•Lust System granted by this enigmatic entity, Julien embarks on a perilous journey to ascend the Tower and become the one and only—Grand Lust Sovereign.