Maoyuu Maou Yuusha - Volume 1 Chapter 1, “The Demon King’s Castle, that Profound Audience”

10 years searching for his lost sibling.

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

Bad End Night is a novel by Hitoshizuku-P, based on a series of Vocaloid songs, the NighT Series. The plot revolves around eight actors trapped in a never-ending play, seeking a way to escape.

I just want to be different, no one can guess what I want to do, the more mysterious the more powerful.

- Description from novelbuddy