The Best Assassin, Incarnated into a Different World's Aristocrat - Episode 18: Assassin gathers information

Zhong Yansheng lived for eighteen years. After accidentally falling into the water, he dreamed and found that he was living in a book. In the book, he was a fake young master who was mistakenly adopted by the Marquis. After the real young master came back, he {real} was not taken seriously by the family and was driven to a separate courtyard in the suburbs of Beijing. His parents only doted on him {fake}, and they turned the real young master into a black hearted man, and finally his family was ruined. After waking up, Zhong Yansheng learned the news that Master Zhen returned to the house three days ago, but the whole family only revolved around him {fake} who was sick.

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

She has come a long way.

Orphaned, born a weakling, and being the infamous good-for-nothing of Azure Dragon Country. Gu Ruoyun was the shame of the proud Gu household. Falsely accused of a crime she did not commit, she was betrayed by her family and beaten to death by her own grandfather. But life took a fateful twist on that very day — she was revived.

Newly awakened, she is now the Master of an ancient treasure that resides within her body. Precious cultivation pills, treasures beyond her wildest imagination and spiritual beasts, all within her grasp… She is the apple of the eye of all under the heavens, including that of a mysterious, handsome man.

Now she only has one goal — to conquer the world.

- Description from Novelupdates

I was on my way home with my friend when suddenly, I spotted a catgirl cosplayer who made my heart skip a beat.But something felt off—I couldn’t recall seeing her in any anime, manga, or games I had ever come across. Confused, I asked my friend standing next to me.To my shock, his response sent chills down my spine:“Huh? What catgirl? What are you talking about?”Suddenly, a truck came barreling toward the girl. Without thinking, I rushed to save her. In the end, both of us were hit by the truck.Now, I find myself reincarnated in another world—in the body of the very catgirl I had seen.But... who is this girl?How is she related to the dungeons that keep popping up in this new world?