Contract Marriage - Chapter 4

Suzumiya Kaede, a gamer, fell asleep while playing a game all night and when he woke up he found himself in another world, a fantasy world where using magic is possible! Using his knowledge of games, skills, and cheats, Kaede decides to enjoy as much of his new life in a different world through his newly-acquired magic and sword!

Witnessing her boyfriend cheating on her with her bestie, Shiyao was so angry that she went to a pub for fun and met a man, who was really a piece of work. After a crazy night she fled away, but was embarrassed to know that the man she slept with was her boss You Ze.
Jesus, give her a break!

- Description from Novelupdates

If the Red Dragon's head could pour out half a skull's worth of magma, the world would then witness the rise of the most enlightened monarch—the Red Dragon Book.David closed the book, a puff of Dragon Breath turned it to ash, and he whipped himself up a bottle of Fiendfire Elixir.To hell with bloody rationality.I just want to do as I please!This is the story of a Red Dragon rampaging through an alternate world, constantly rewarding itself by embodying the Seven Deadly Sins.

This is probably the story of a modern man who became the Seventh son of Kangxi in the Qing Dynasty. This is probably the story of how the Seventh brother Yinyou worked hard and fell in love by the way. So there is no doubt that this article is ambiguous, and it is easy to guess who the couple is.

- Description from Novelupdates