Shini Yasui Kōshaku Reijō to Nana-ri no Kikōshi - Chapter 18 - Klaus Harvan’s Letter

Time flies quickly; may you enjoy a cup of drink.I know not the height of the green mountain, nor the depth of the earth.Only watching as the seasons change, that it took people's lives.

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

Having been confessed by the person you in love with must be a dream come true.That happened to me. However, I found out later that the confession is not meant for me but for my classmate named Kyzer. he’s handsome, rich, and popular. On top of that, he’s a top student.It all happened because of the tiger costume I am wearing .Feeling defeated, I went back home with a bleeding heart.On my way toward home, a white van stopped in front of me and abducted me. I was abducted because they thought I was Kyzer thanks to the costume.A series of misfortunes befell to me one after another.When I opened my eyes again, I found myself in an unfamiliar room. Then I become the subject of a weird experiment.In the next day, I woke up in my bed by a loud ringing and discovered some weird widgets floating in front of my vision.I learned later that the peaceful city I was living till today is now in an apocalyptic situation. Demonic creatures were running rampant causing chaos to the land.Using my System, I will survive in this apocalypse.

The Yaoguang Realm expelled the foreign demons from the human race, and established the ninth-grade family and sect. At this point, the Yaoguang Realm came to an era ruled by the family and the sect.

The ninth rank rules a city, the eighth rank rules a county, the seventh rank rules a state, the sixth rank rules a country…

Chen Yang came through with He Daozhu, cultivated a powerful bloodline monster, raised the farm, and led the Chen family to become the current saint.

- Description from novelbuddy